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003378tmsKT - Turner Motorsport Catback Valved Exhaust - E9X 335i N54/N55

Turner Motorsport Catback Valved Exhaust - E9X 335i N54/N55

Turner Motorsport

T#: 586137 | Part#: 003378tmsKT

affirm Starting At 0% APR - Subject To Eligibility. See Lending Terms

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SALE: $1682.96 (10% OFF)

WAS: $1869.95 on 06-14-2026

This product was last offered at the strikethrough price on
06-14-2026

Lifetime Replacement

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Product Details

*Click here for installation instructions.*

New to our lineup of exceptional performance upgrades for your BMW, the Turner E9X 335i catback exhaust system is here to improve your driving experience with hearty exhaust notes and a noticeable bump in performance. Our Exhaust system Sports Mandrel bent dual 2.5” 304SS pipes with a nice brushed finish. Exhaust gases flow through efficient piping to High flow, valved, stainless steel mufflers. Under normal driving conditions, the vacuum controlled muffler valves stay closed, and the exhaust is quite unassuming. Nobody will really even suspect your car even has an aftermarket exhaust system, as it sounds nearly identical to the factory system. But, when you open up the throttle, the vacuum controlled valves open up, and this exhaust gives your car a menacing growl. Designed to mount using the factory exhaust hangers, this exhaust is a bolt-on replacement for the OE version. To help reduce the time you spend installing the system, Accuseal slip-fit joints are included to make fitment as easy as possible. The Turner Motorsport full exhaust system includes a High flow, valved, stainless-steel muffler and is available as an axle-back, cat-back, as well as a full turbo-back system. Give your 335i the dual-purpose exhaust system that satisfies both your neighbors and your need for volume with the Turner Motorsport E9X 335i full exhaust system.

Sound clips! Check out this product highlight featured on the ECS Tuning YouTube channel to hear this exhaust in action!

Features:

Mandrel bent dual 2.5” 304SS pipe with brushed finish
Turner Engraved Polished exhaust tips
High flow, valved, stainless steel muffler
Accuseal slip fit joints for easy fitment
Utilizes factory exhaust hangers

Available as an Axle Back, Cat-back, as well as Turbo-back.

Not for sale or use in the state of California on any pollution-controlled vehicle as per the California Air Resources Board.

Prop 65 Warning

Cross Reference

18307592448
18307553826
18307553827
18307553828
18307613660
18307615959
18307647064
18307647065

Kit Contents

Qty	Description	T#	Part#	Lifetime
4	Rein Copper Exhaust Lock Nut	T#348775	11621711954~CRP	YES
2	Elring Downpipe to Midpipe Exhaust Gasket - N54 BMW	T#340661	18307553603~ELR	YES
1	AXLE BACK EXHAUST	T#586129	003378TMS01~A	YES
1	Turner E9x Mid Section	T#586128	003378TMS02~A	YES
2	Turner 3.5" Universal Single Wall Exhaust Tip w/ Brushed Finish	T#599664	026374TMS04-01~A	YES
1	Remote Key Fob Switch Set & Exhaust Valve Installation Kit (Dual Valve)	T#18965462	591209-37~BRP	YES

Product Q&A

Lifetime Replacement

This Product Is Covered By Our Lifetime Replacement Program

Products protected by our Lifetime Replacement Program are covered for as long as you own the product, no need to worry about an expiration date. Purchase your products and enjoy some worry-free motoring, knowing we've got you covered.

If you have any questions, would like to learn more or are ready to place a replacement claim, click here!

Fits These Cars

MAKE	MODEL	SUBMODEL	ENGINE	Special Fitment Notes
BMW	E90	335i	N54 3.0L	Use vehicle selector to confirm fitment
BMW	E90	335i	N55 3.0L	Use vehicle selector to confirm fitment
BMW	E90	335xi	N54 3.0L	Use vehicle selector to confirm fitment
BMW	E90	335xi	N55 3.0L	Use vehicle selector to confirm fitment
BMW	E92	335i	N54 3.0L	Use vehicle selector to confirm fitment
BMW	E92	335i	N55 3.0L	Use vehicle selector to confirm fitment
BMW	E92	335is	N54 3.0L	Use vehicle selector to confirm fitment
BMW	E92	335xi	N54 3.0L	Use vehicle selector to confirm fitment
BMW	E92	335xi	N55 3.0L	Use vehicle selector to confirm fitment

*The above product applications have been written by Turner Motorsport. All warranties, product application, fitment, and performance are the responsibility of Turner Motorsport. For additional information see the terms of use.