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2021 Toyota 4Runner
2021 Toyota 4Runner Exhaust Systems
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Part Number: M79S5342AL
Guaranteed to Fit
$349.99
Vehicle Fitment
- 2021 Toyota 4Runner Base 6 Cyl 4.0L Sport Utility, Four Wheel Drive
- 2021 Toyota 4Runner Nightshade 6 Cyl 4.0L Sport Utility, Rear Wheel Drive
- 2021 Toyota 4Runner Venture 6 Cyl 4.0L Sport Utility, Four Wheel Drive
- 2021 Toyota 4Runner TRD Off-Road 6 Cyl 4.0L Sport Utility, Four Wheel Drive
- 2021 Toyota 4Runner SR5 6 Cyl 4.0L Sport Utility, Rear Wheel Drive
- 2021 Toyota 4Runner TRD Off-Road Premium 6 Cyl 4.0L Sport Utility, Four Wheel Drive
- 2021 Toyota 4Runner Trail 6 Cyl 4.0L Sport Utility, Four Wheel Drive
- 2021 Toyota 4Runner Limited 6 Cyl 4.0L Sport Utility, Rear Wheel Drive
- 2021 Toyota 4Runner TRD Pro 6 Cyl 4.0L Sport Utility, Four Wheel Drive
- 2021 Toyota 4Runner SR5 Premium 6 Cyl 4.0L Sport Utility, Four Wheel Drive
Product Details
Material : Made of Aluminized SteelSeries : Installer SeriesSystem Type : Cat-BackQuantity Sold : KitWarranty : MBRP Lifetime Limited WarrantyProp 65 Warning :
WARNING: This product can expose you to chemical which is known to the State of California to cause cancer and birth defects or other reproductive harm. For more information go to www.P65Warnings.ca.gov.
Part Number: B25140379
Guaranteed to Fit
$799.99
Vehicle Fitment
- 2021 Toyota 4Runner Base 6 Cyl 4.0L
- 2021 Toyota 4Runner Nightshade 6 Cyl 4.0L
- 2021 Toyota 4Runner Venture 6 Cyl 4.0L
- 2021 Toyota 4Runner TRD Off-Road 6 Cyl 4.0L
- 2021 Toyota 4Runner SR5 6 Cyl 4.0L
- 2021 Toyota 4Runner TRD Off-Road Premium 6 Cyl 4.0L
- 2021 Toyota 4Runner Trail 6 Cyl 4.0L
- 2021 Toyota 4Runner Limited 6 Cyl 4.0L
- 2021 Toyota 4Runner TRD Pro 6 Cyl 4.0L
- 2021 Toyota 4Runner SR5 Premium 6 Cyl 4.0L
Product Details
Material : Made of Stainless SteelSeries : Touring SeriesSystem Type : Cat-BackQuantity Sold : KitWarranty : Million-mile Borla limited warrantyProp 65 Warning :
WARNING: This product can expose you to chemicals including Chromium, Nickel, Cobalt, Arsenic, Cadmium and Lead, which are known to the State of California to cause cancer and birth defects or other reproductive harm. For more information go to www.P65Warnings.ca.gov.
Part Number: F13817961
Guaranteed to Fit
$354.95
Vehicle Fitment
- 2021 Toyota 4Runner Base 6 Cyl 4.0L Sport Utility, 4WD
- 2021 Toyota 4Runner Nightshade 6 Cyl 4.0L Sport Utility, RWD
- 2021 Toyota 4Runner Venture 6 Cyl 4.0L Sport Utility, 4WD
- 2021 Toyota 4Runner TRD Off-Road 6 Cyl 4.0L Sport Utility, 4WD
- 2021 Toyota 4Runner SR5 6 Cyl 4.0L Sport Utility, 4WD
- 2021 Toyota 4Runner TRD Off-Road Premium 6 Cyl 4.0L Sport Utility, 4WD
- 2021 Toyota 4Runner Trail 6 Cyl 4.0L Sport Utility, 4WD
- 2021 Toyota 4Runner Limited 6 Cyl 4.0L Sport Utility, 4WD
- 2021 Toyota 4Runner TRD Pro 6 Cyl 4.0L Sport Utility, 4WD
- 2021 Toyota 4Runner SR5 Premium 6 Cyl 4.0L Sport Utility, RWD
Product Details
Material : Made of Stainless SteelSeries : Outlaw SeriesSystem Type : Cat-BackQuantity Sold : KitWarranty : Lifetime Flowmaster Limited WarrantyProp 65 Warning :
WARNING: This product can expose you to chemical which is known to the State of California to cause cancer and birth defects or other reproductive harm. For more information go to www.P65Warnings.ca.gov.
Part Number: F13717972
Guaranteed to Fit
$322.15
Vehicle Fitment
- 2021 Toyota 4Runner Base 6 Cyl 4.0L Sport Utility, 4WD
- 2021 Toyota 4Runner Nightshade 6 Cyl 4.0L Sport Utility, RWD
- 2021 Toyota 4Runner Venture 6 Cyl 4.0L Sport Utility, 4WD
- 2021 Toyota 4Runner TRD Off-Road 6 Cyl 4.0L Sport Utility, 4WD
- 2021 Toyota 4Runner SR5 6 Cyl 4.0L Sport Utility, 4WD
- 2021 Toyota 4Runner TRD Off-Road Premium 6 Cyl 4.0L Sport Utility, 4WD
- 2021 Toyota 4Runner Trail 6 Cyl 4.0L Sport Utility, 4WD
- 2021 Toyota 4Runner Limited 6 Cyl 4.0L Sport Utility, 4WD
- 2021 Toyota 4Runner TRD Pro 6 Cyl 4.0L Sport Utility, 4WD
- 2021 Toyota 4Runner SR5 Premium 6 Cyl 4.0L Sport Utility, RWD
Product Details
Material : Made of Stainless SteelSeries : FlowFX SeriesSystem Type : Cat-BackQuantity Sold : KitWarranty : Lifetime Flowmaster Limited WarrantyProp 65 Warning :
WARNING: This product can expose you to chemical which is known to the State of California to cause cancer and birth defects or other reproductive harm. For more information go to www.P65Warnings.ca.gov.
Part Number: M79S5342BLK
Guaranteed to Fit
$489.99
Vehicle Fitment
- 2021 Toyota 4Runner Base 6 Cyl 4.0L Sport Utility, Four Wheel Drive
- 2021 Toyota 4Runner Nightshade 6 Cyl 4.0L Sport Utility, Rear Wheel Drive
- 2021 Toyota 4Runner Venture 6 Cyl 4.0L Sport Utility, Four Wheel Drive
- 2021 Toyota 4Runner TRD Off-Road 6 Cyl 4.0L Sport Utility, Four Wheel Drive
- 2021 Toyota 4Runner SR5 6 Cyl 4.0L Sport Utility, Rear Wheel Drive
- 2021 Toyota 4Runner TRD Off-Road Premium 6 Cyl 4.0L Sport Utility, Four Wheel Drive
- 2021 Toyota 4Runner Trail 6 Cyl 4.0L Sport Utility, Four Wheel Drive
- 2021 Toyota 4Runner Limited 6 Cyl 4.0L Sport Utility, Rear Wheel Drive
- 2021 Toyota 4Runner TRD Pro 6 Cyl 4.0L Sport Utility, Four Wheel Drive
- 2021 Toyota 4Runner SR5 Premium 6 Cyl 4.0L Sport Utility, Four Wheel Drive
Product Details
Material : Made of Aluminized SteelSeries : Black SeriesSystem Type : Cat-BackQuantity Sold : KitWarranty : MBRP Lifetime Limited WarrantyProp 65 Warning :
WARNING: This product can expose you to chemical which is known to the State of California to cause cancer and birth defects or other reproductive harm. For more information go to www.P65Warnings.ca.gov.
Part Number: F13717805
Guaranteed to Fit
$443.95
Vehicle Fitment
- 2021 Toyota 4Runner Base 6 Cyl 4.0L Sport Utility, 4WD
- 2021 Toyota 4Runner Nightshade 6 Cyl 4.0L Sport Utility, RWD
- 2021 Toyota 4Runner Venture 6 Cyl 4.0L Sport Utility, 4WD
- 2021 Toyota 4Runner TRD Off-Road 6 Cyl 4.0L Sport Utility, 4WD
- 2021 Toyota 4Runner SR5 6 Cyl 4.0L Sport Utility, 4WD
- 2021 Toyota 4Runner TRD Off-Road Premium 6 Cyl 4.0L Sport Utility, 4WD
- 2021 Toyota 4Runner Trail 6 Cyl 4.0L Sport Utility, 4WD
- 2021 Toyota 4Runner Limited 6 Cyl 4.0L Sport Utility, 4WD
- 2021 Toyota 4Runner TRD Pro 6 Cyl 4.0L Sport Utility, 4WD
- 2021 Toyota 4Runner SR5 Premium 6 Cyl 4.0L Sport Utility, RWD
Product Details
Notes : 14 in. Muffler Body Length; 2.5 in. Muffler Outlet Diameter; 20 in. Muffler Overall Length; (1) Muffler Quantity; Natural Muffler Color; Brushed Muffler Finish; Centered Muffler Inlet Location; Centered Muffler Outlet Location; Round Muffler Shape; Absorption Muffler Type; Aggressive/Moderate Sound Level; Angle Tip Cut; Rolled Tip Edge Style; Black Ceramic Tip Finish; Embossed Tip Logo; 304 Stainless Tip Material; Round Tip Shape; Single Wall Tip StyleMaterial : Made of Stainless SteelSeries : FlowFX SeriesSystem Type : Cat-BackQuantity Sold : KitWarranty : Lifetime Flowmaster Limited WarrantyProp 65 Warning :
WARNING: This product can expose you to chemical which is known to the State of California to cause cancer and birth defects or other reproductive harm. For more information go to www.P65Warnings.ca.gov.
Part Number: BO1060756
Guaranteed to Fit
$628.00
Vehicle Fitment
- 2021 Toyota 4Runner Base 6 Cyl 4.0L Sport Utility, Four Wheel Drive, Installation Hardware Included; Replacement System
- 2021 Toyota 4Runner Nightshade 6 Cyl 4.0L Sport Utility, Four Wheel Drive, Installation Hardware Included; Replacement System
- 2021 Toyota 4Runner Venture 6 Cyl 4.0L Sport Utility, Four Wheel Drive, Installation Hardware Included; Replacement System
- 2021 Toyota 4Runner TRD Off-Road 6 Cyl 4.0L Sport Utility, Four Wheel Drive, Installation Hardware Included; Replacement System
- 2021 Toyota 4Runner SR5 6 Cyl 4.0L Sport Utility, Four Wheel Drive, Installation Hardware Included; Replacement System
- 2021 Toyota 4Runner TRD Off-Road Premium 6 Cyl 4.0L Sport Utility, Four Wheel Drive, Installation Hardware Included; Replacement System
- 2021 Toyota 4Runner Trail 6 Cyl 4.0L Sport Utility, Rear Wheel Drive, Installation Hardware Included; Replacement System
- 2021 Toyota 4Runner Limited 6 Cyl 4.0L Sport Utility, Four Wheel Drive, Installation Hardware Included; Replacement System
- 2021 Toyota 4Runner TRD Pro 6 Cyl 4.0L Sport Utility, Four Wheel Drive, Installation Hardware Included; Replacement System
- 2021 Toyota 4Runner SR5 Premium 6 Cyl 4.0L Sport Utility, Rear Wheel Drive, Installation Hardware Included; Replacement System
Product Details
Material : Made of Stainless SteelQuantity Sold : KitWarranty : 2-year BRExhaust limited warrantyProp 65 Warning :
WARNING: This product can expose you to chemical which is known to the State of California to cause cancer and birth defects or other reproductive harm. For more information go to www.P65Warnings.ca.gov.
Part Number: A1549460411
Guaranteed to Fit
$645.00
Vehicle Fitment
- 2021 Toyota 4Runner Base 6 Cyl 4.0L This item will only fit models equipped with Kinetic Dynamic Suspension System (KDSS)
- 2021 Toyota 4Runner Nightshade 6 Cyl 4.0L This item will only fit models equipped with Kinetic Dynamic Suspension System (KDSS)
- 2021 Toyota 4Runner Venture 6 Cyl 4.0L This item will only fit models equipped with Kinetic Dynamic Suspension System (KDSS)
- 2021 Toyota 4Runner TRD Off-Road 6 Cyl 4.0L This item will only fit models equipped with Kinetic Dynamic Suspension System (KDSS)
- 2021 Toyota 4Runner SR5 6 Cyl 4.0L This item will only fit models equipped with Kinetic Dynamic Suspension System (KDSS)
- 2021 Toyota 4Runner TRD Off-Road Premium 6 Cyl 4.0L This item will only fit models equipped with Kinetic Dynamic Suspension System (KDSS)
- 2021 Toyota 4Runner Trail 6 Cyl 4.0L This item will only fit models equipped with Kinetic Dynamic Suspension System (KDSS)
- 2021 Toyota 4Runner Limited 6 Cyl 4.0L This item will only fit models equipped with Kinetic Dynamic Suspension System (KDSS)
- 2021 Toyota 4Runner TRD Pro 6 Cyl 4.0L This item will only fit models equipped with Kinetic Dynamic Suspension System (KDSS)
- 2021 Toyota 4Runner SR5 Premium 6 Cyl 4.0L This item will only fit models equipped with Kinetic Dynamic Suspension System (KDSS)
Product Details
Notes : Adds up to +11 HP/ +19 lbs. ft. torqueMaterial : Made of Stainless SteelSeries : Power Machforce XP SeriesSystem Type : Cat-BackQuantity Sold : KitWarranty : 2-year AFE limited warrantyProp 65 Warning :
WARNING: This product can expose you to chemical which is known to the State of California to cause cancer and birth defects or other reproductive harm. For more information go to www.P65Warnings.ca.gov.
Part Number: D25140760
Guaranteed to Fit
$738.99
Vehicle Fitment
- 2021 Toyota 4Runner TRD Off-Road 6 Cyl 4.0L Passenger Side
- 2021 Toyota 4Runner TRD Pro 6 Cyl 4.0L Passenger Side
- 2021 Toyota 4Runner TRD Off-Road Premium 6 Cyl 4.0L Passenger Side
Product Details
Notes : Aggressive/Loud Exhaust System Sound; Turndown Tip StyleMaterial : Made of Stainless SteelSeries : S-type SeriesSystem Type : Cat-BackQuantity Sold : KitWarranty : Million-mile Borla limited warranty and 1 year Borla limited warranty for Black Coatings, Tip Finishes and Carbon Fiber partsProp 65 Warning :
WARNING: This product can expose you to chemical which is known to the State of California to cause cancer and birth defects or other reproductive harm. For more information go to www.P65Warnings.ca.gov.
Part Number: M6619546
Guaranteed to Fit
$816.00
Vehicle Fitment
- 2021 Toyota 4Runner Base 6 Cyl 4.0L Sport Utility, Four Wheel Drive, Single Passenger Side Rear Exit
- 2021 Toyota 4Runner Nightshade 6 Cyl 4.0L Sport Utility, Four Wheel Drive, Single Passenger Side Rear Exit
- 2021 Toyota 4Runner Venture 6 Cyl 4.0L Sport Utility, Four Wheel Drive, Single Passenger Side Rear Exit
- 2021 Toyota 4Runner TRD Off-Road 6 Cyl 4.0L Sport Utility, Four Wheel Drive, Single Passenger Side Rear Exit
- 2021 Toyota 4Runner SR5 6 Cyl 4.0L Sport Utility, Rear Wheel Drive, Single Passenger Side Rear Exit
- 2021 Toyota 4Runner TRD Off-Road Premium 6 Cyl 4.0L Sport Utility, Four Wheel Drive, Single Passenger Side Rear Exit
- 2021 Toyota 4Runner Trail 6 Cyl 4.0L Sport Utility, Four Wheel Drive, Single Passenger Side Rear Exit
- 2021 Toyota 4Runner Limited 6 Cyl 4.0L Sport Utility, Four Wheel Drive, Single Passenger Side Rear Exit
- 2021 Toyota 4Runner TRD Pro 6 Cyl 4.0L Sport Utility, Four Wheel Drive, Single Passenger Side Rear Exit
- 2021 Toyota 4Runner SR5 Premium 6 Cyl 4.0L Sport Utility, Four Wheel Drive, Single Passenger Side Rear Exit
Product Details
Material : Made of Stainless SteelSeries : Overland SeriesSystem Type : Cat-BackQuantity Sold : KitWarranty : Lifetime Magnaflow limited construction warranty and 1-year Magnaflow limited finish warrantyProp 65 Warning :
WARNING: This product can expose you to chemical which is known to the State of California to cause cancer and birth defects or other reproductive harm. For more information go to www.P65Warnings.ca.gov.
Part Number: A1549360401B
Guaranteed to Fit
$954.00
Vehicle Fitment
- 2021 Toyota 4Runner Base 6 Cyl 4.0L Does Not fit Models Equipped With Kinetic Dynamic Suspension System (KDSS)
- 2021 Toyota 4Runner Nightshade 6 Cyl 4.0L Does Not fit Models Equipped With Kinetic Dynamic Suspension System (KDSS)
- 2021 Toyota 4Runner Venture 6 Cyl 4.0L Does Not fit Models Equipped With Kinetic Dynamic Suspension System (KDSS)
- 2021 Toyota 4Runner TRD Off-Road 6 Cyl 4.0L Does Not fit Models Equipped With Kinetic Dynamic Suspension System (KDSS)
- 2021 Toyota 4Runner SR5 6 Cyl 4.0L Does Not fit Models Equipped With Kinetic Dynamic Suspension System (KDSS)
- 2021 Toyota 4Runner TRD Off-Road Premium 6 Cyl 4.0L Does Not fit Models Equipped With Kinetic Dynamic Suspension System (KDSS)
- 2021 Toyota 4Runner Trail 6 Cyl 4.0L Does Not fit Models Equipped With Kinetic Dynamic Suspension System (KDSS)
- 2021 Toyota 4Runner Limited 6 Cyl 4.0L Does Not fit Models Equipped With Kinetic Dynamic Suspension System (KDSS)
- 2021 Toyota 4Runner TRD Pro 6 Cyl 4.0L Does Not fit Models Equipped With Kinetic Dynamic Suspension System (KDSS)
- 2021 Toyota 4Runner SR5 Premium 6 Cyl 4.0L Does Not fit Models Equipped With Kinetic Dynamic Suspension System (KDSS)
Product Details
Notes : Adds up to +11 HP/ +19 lbs. ft. torque; Black TipsMaterial : Made of Stainless SteelSeries : Power Machforce XP SeriesSystem Type : Cat-BackQuantity Sold : KitWarranty : 2-year AFE limited warrantyProp 65 Warning :
WARNING: This product can expose you to chemical which is known to the State of California to cause cancer and birth defects or other reproductive harm. For more information go to www.P65Warnings.ca.gov.
Part Number: M6615145
Guaranteed to Fit
$984.00
Vehicle Fitment
- 2021 Toyota 4Runner Base 6 Cyl 4.0L Sport Utility, Four Wheel Drive, Single Straight Passenger Side Rear Exit
- 2021 Toyota 4Runner Nightshade 6 Cyl 4.0L Sport Utility, Four Wheel Drive, Single Straight Passenger Side Rear Exit
- 2021 Toyota 4Runner Venture 6 Cyl 4.0L Sport Utility, Four Wheel Drive, Single Straight Passenger Side Rear Exit
- 2021 Toyota 4Runner TRD Off-Road 6 Cyl 4.0L Sport Utility, Four Wheel Drive, Single Straight Passenger Side Rear Exit
- 2021 Toyota 4Runner SR5 6 Cyl 4.0L Sport Utility, Four Wheel Drive, Single Straight Passenger Side Rear Exit
- 2021 Toyota 4Runner TRD Off-Road Premium 6 Cyl 4.0L Sport Utility, Four Wheel Drive, Single Straight Passenger Side Rear Exit
- 2021 Toyota 4Runner Trail 6 Cyl 4.0L Sport Utility, Rear Wheel Drive, Single Straight Passenger Side Rear Exit
- 2021 Toyota 4Runner Limited 6 Cyl 4.0L Sport Utility, Rear Wheel Drive, Single Straight Passenger Side Rear Exit
- 2021 Toyota 4Runner TRD Pro 6 Cyl 4.0L Sport Utility, Four Wheel Drive, Single Straight Passenger Side Rear Exit
- 2021 Toyota 4Runner SR5 Premium 6 Cyl 4.0L Sport Utility, Rear Wheel Drive, Single Straight Passenger Side Rear Exit
Product Details
Material : Made of Stainless SteelSeries : MF SeriesSystem Type : Cat-BackQuantity Sold : KitWarranty : Lifetime Magnaflow Limited WarrantyProp 65 Warning :
WARNING: This product can expose you to chemical which is known to the State of California to cause cancer and birth defects or other reproductive harm. For more information go to www.P65Warnings.ca.gov.
Part Number: M79S5343AL
Guaranteed to Fit
$344.99
Vehicle Fitment
- 2021 Toyota 4Runner Base 6 Cyl 4.0L Sport Utility, Four Wheel Drive
- 2021 Toyota 4Runner Nightshade 6 Cyl 4.0L Sport Utility, Rear Wheel Drive
- 2021 Toyota 4Runner Venture 6 Cyl 4.0L Sport Utility, Four Wheel Drive
- 2021 Toyota 4Runner TRD Off-Road 6 Cyl 4.0L Sport Utility, Four Wheel Drive
- 2021 Toyota 4Runner SR5 6 Cyl 4.0L Sport Utility, Rear Wheel Drive
- 2021 Toyota 4Runner TRD Off-Road Premium 6 Cyl 4.0L Sport Utility, Four Wheel Drive
- 2021 Toyota 4Runner Trail 6 Cyl 4.0L Sport Utility, Four Wheel Drive
- 2021 Toyota 4Runner Limited 6 Cyl 4.0L Sport Utility, Rear Wheel Drive
- 2021 Toyota 4Runner TRD Pro 6 Cyl 4.0L Sport Utility, Four Wheel Drive
- 2021 Toyota 4Runner SR5 Premium 6 Cyl 4.0L Sport Utility, Four Wheel Drive
Product Details
Material : Made of Aluminized SteelSeries : Armor Lite SeriesSystem Type : Cat-BackQuantity Sold : KitWarranty : 3-year MBRP limited warrantyProp 65 Warning :
WARNING: This product can expose you to chemical which is known to the State of California to cause cancer and birth defects or other reproductive harm. For more information go to www.P65Warnings.ca.gov.
Part Number: M79S5343304
Guaranteed to Fit
$554.99
Vehicle Fitment
- 2021 Toyota 4Runner Base 6 Cyl 4.0L Sport Utility, Four Wheel Drive
- 2021 Toyota 4Runner Nightshade 6 Cyl 4.0L Sport Utility, Rear Wheel Drive
- 2021 Toyota 4Runner Venture 6 Cyl 4.0L Sport Utility, Four Wheel Drive
- 2021 Toyota 4Runner TRD Off-Road 6 Cyl 4.0L Sport Utility, Four Wheel Drive
- 2021 Toyota 4Runner SR5 6 Cyl 4.0L Sport Utility, Rear Wheel Drive
- 2021 Toyota 4Runner TRD Off-Road Premium 6 Cyl 4.0L Sport Utility, Four Wheel Drive
- 2021 Toyota 4Runner Trail 6 Cyl 4.0L Sport Utility, Four Wheel Drive
- 2021 Toyota 4Runner Limited 6 Cyl 4.0L Sport Utility, Rear Wheel Drive
- 2021 Toyota 4Runner TRD Pro 6 Cyl 4.0L Sport Utility, Four Wheel Drive
- 2021 Toyota 4Runner SR5 Premium 6 Cyl 4.0L Sport Utility, Four Wheel Drive
Product Details
Material : Made of Stainless SteelSeries : Armor Pro SeriesSystem Type : Cat-BackQuantity Sold : KitWarranty : Lifetime MBRP limited warrantyProp 65 Warning :
WARNING: This product can expose you to chemical which is known to the State of California to cause cancer and birth defects or other reproductive harm. For more information go to www.P65Warnings.ca.gov.
Page 1 of 1 | Showing 1 - 14 of 14 results
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Product Questions & Answers
Q:Will this muffler be similar in noise level to a stock 4Runner muffler? Want to switch out my TRD pro exhaust for something quieter. Show Less
Cory D.
A:BEST ANSWERHi Cory, I'm pleased to assist you. Yes, this has a moderate sound level, quieter. Click the link below to continue ordering and take advantage of our flash sale and limited supplies.
https://www.carparts.com/exhaust-system/mbrp/m79s5343al?can=CPGG4850_CSQA_20230426
I hope this is helpful. Enjoy shopping! Show less
Grace G.
1 Question, 1 AnswerView all Q&As >
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Engine Knocking Sound: What Does it Mean?You may notice that the noise becomes more frequent when engine speed is increased, especially if the sound is due to a failed bearing.
What Does a Knocking Noise in the Engine Mean?