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003378tmsktKT1 - Turner Motorsport Axle Back Exhaust - E9X 335i N54

Turner Motorsport Axle Back Exhaust - E9X 335i N54

Turner Motorsport

T#: 586745 | Part#: 003378tmsktKT1

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

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SALE: $1525.49 (10% OFF)

WAS: $1694.99 on 06-14-2026

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

Lifetime Replacement

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Availability:

Available from Supplier

Est. Ship Date:

Ships Jul 9, 2026

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Product Details

*Click here for installation instructions.*

New to our line of exceptional performance upgrades for your BMW, the Turner Motorsport E9X 335i (N54) Valved Axle-back exhaust system is here to improve your driving experience with hearty exhaust notes and a noticeable bump in performance. With the muffler valves closed, this exhaust is quite unassuming. Nobody will suspect your car even has an aftermarket exhaust system, as it sounds very much like the factory system. But, when you open up the valves, using the supplied valve controller, this exhaust transforms your car, giving your car a menacing growl!

Now, we get it, not everyone can, or wants to delete their factory cats. Whether it be emissions testing or a check engine light, the smell of unfiltered exhaust, the very aggressive sound, or warranty reasons. Whatever the reason, We've got you covered! This exhaust setup leaves all 4 factory cats in place, making it 100% emissions legal for everyone, even California!

This exhaust sports Mandrel bent dual 2.5” 304SS pipes with a brushed finish, with exhaust gases flowing through efficient piping to High flow, valved, stainless steel mufflers. Designed to mount with the factory exhaust hangers, this exhaust is a bolt-on replacement for the OE version. To help reduce the time you spend under the car 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 system, 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 sound 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!

Kit Includes:

Turner Axle back Exhaust with X pipe
Turner Adapter pipes for Factory Mid Pipes
Turner Muffler Valve Controller Kit
Turner Engraved Exhaust Tips

Features:

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

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

This kit is perfect to pair with our very own Turner Motorsport 3" High-Flow Catted Downpipes!

Prop 65 Warning

Kit Contents

Qty	Description	T#	Part#	Lifetime
4	Genuine BMW Collar Nut - 18307597650	T#48484	18307597650	YES
1	Remote Key Fob Switch Set & Exhaust Valve Installation Kit (Dual Valve)	T#586741	591209-02	YES
2	Dual Clamp Exhaust Sleeve - Priced Each	T#586755	893253139B~VAI	YES
1	AXLE BACK EXHAUST	T#586129	003378TMS01~A	YES
1	Adapter Pipes	T#586131	003378TMS04~A	YES
2	Elring Exhaust Gasket - F80, F82, F83	T#588632	18307851168~ELR	YES
2	Turner 3.5" Universal Single Wall Exhaust Tip w/ Brushed Finish	T#599664	026374TMS04-01~A	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	335xi	N54 3.0L	Use vehicle selector to confirm fitment
BMW	E92	335i	N54 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

*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.

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Turner Motorsport Axle Back Exhaust - E9X 335i N54

Product Details

Kit Contents

Product Q&A

Lifetime Replacement

This Product Is Covered By Our Lifetime Replacement Program

Fits These Cars