BMW Exhaust Parts, Mufflers & Catalytic Converters for BMW 3 Series E90 (2006-2011)

A true dual exhaust featuring twin oversized 2.5" exhaust sections, lightweight mufflers, and a rowdy exhaust note.

Prepare to give your 335 the boost it deserves. Our cat-back exhaust was made to redefine the driving experience of your E9x. Manufactured from premium brushed stainless steel, it is not just about reducing weight; it's about enhancing performance with unrestricted airflow. And the sound? It's a symphony of power and precision, carefully crafted for an unforgettable soundtrack. The sound experience is more than you could ask for. With the freedom of exhaust flow and tuned exhaust note, we are very excited to get these exhausts on 335's everywhere, don't wait!

In crafting the 335 exhaust systems, the primary focus is achieving the perfect balance of sound and comfort. We understand the desire for a thrilling exhaust note without the annoyance of highway drone or interior vibrations. ECS's cat-back exhaust for your 335 incorporates this balance, offering a strategic blend of sportiness and practicality. Drawing from their extensive experience, particularly with N54 and N55 E chassis, ECS engineered an exhaust packed with innovative features, compatible with factory and aftermarket downpipes. Experience the perfect blend of performance and everyday usability.

There is something about a cat-back exhaust that is just so good. Being able to unbolt and replace the entire visible exhaust gives you butterflies in your stomach. A fresh new exhaust and just knowing that things are about to get rowdy. The ECS exhaust features twin 2.5" brushed pipes with flanges that bolt directly to your factory and aftermarket downpipes. The dual 2.5" mid-pipes make their way toward the rear axle with smooth transitions for effortless exhaust flow. Replacing the large suitcase muffler is a pair of 2.5" turbo-style mufflers that shed weight and give a signature sound. The turbo-style muffler features an inner design that refines the exhaust note to perfection. An extraordinary mixture of both volume and frequency. Paired with the 2.5" mufflers is your choice of 3.5" exhaust tips that give your rear diffuser a sporty look that shouts performance.

Features and Benefits:

Street/Motorsport inspiration
Enhanced exhaust note
Full exhaust replacement
37% lighter than stock!
Stock cat-back: 78lbs
ECS cat-back: 49lbs
Reduction in back pressure for increased throttle response, TQ, and HP
Dual 3.5" fitted exhaust tips
Part Design:

In-house designed and engineered using FARO ARM laser scanning technology and SolidWorks 3D CAD modeling for precision fitment.
T304 Stainless Material in a natural finish - 1.25mm wall thickness, back purged, and TIG-welded throughout
Dual 2.5" Stainless Steel Mandrel Bent Tubing
T304 Stainless Steel 12mm barbed exhaust hangers TIG-Welded in OE locations for precise fitment.​
Strategically placed slip joints provide the most adjustability to obtain perfect fitment
Kit Contents:

Dual 2.5" mid-pipes and rear section
2.5" free-flowing mufflers for better sound, and performance
Clamps and Hardware for an OEM+ install
Optional 3.5" ECS exhaust tips

Enhance your BMW driving experience with the Turner Motorsport E9X 335i (N55) Valved Catback Exhaust. Designed for hearty exhaust notes and improved performance, this exhaust system offers a subtle factory-like sound with closed valves and a menacing growl when opened. Crafted with Mandrel bent dual 2.5” 304SS pipes and a high-flow valved stainless steel muffler, it ensures efficient gas flow.

The kit includes Turner Mid Pipes, a Valved Exhaust, Muffler Valve Controller Kit, and engraved Exhaust Tips. Accuseal slip-fit joints simplify installation, making it a bolt-on replacement for the OE version. The full exhaust system is available as Axle Back, Cat-back, or a full Turbo back system, providing a dual-purpose solution for both your neighbors and your desire for volume.

Key Features:

• Mandrel bent dual 2.5” 304SS pipes 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

N55 Carbon Intake:

Upgrade your N55 engine with the Turner Carbon Intake, breaking away from common setups. The dual inlet design adds functionality without compromising engine bay aesthetics. Located in the "sweet spot," the second inlet maximizes airflow and lowers intake air temps. The bellmouth velocity stack design reduces turbulence for a satisfying flutter after throttle release. The carbon fiber airbox and intake tube feature a gloss clear coat for UV protection, offering a beautiful OEM+ upgrade.

Turner Carbon Fiber Intakes are CAD-designed, ensuring optimal airflow improvement over stock. The kit includes a Carbon Intake Tube, Full Carbon 2 Piece Airbox, Bellmouth Velocity Stack Cone Filter, Billet Turbo Inlet Adapter, Silicone Coupler, and Hardware for Installation.

Key Benefits:

• Increased flow over the factory intake
• Carbon fiber airbox and intake tube with gloss clear coat
• CAD-Designed for perfect integration
• Custom high-flow air filter
• Smooth interior carbon inlet tube for optimal airflow

Design Features:

Carbon Fiber Intake Tube:

• Smooth interior without corrugations for a streamlined flow path
• Integrated carbon flange for secure mounting
• 2x2 twill weave carbon fiber construction
• Gloss finish clear coat for UV protection
• 4-ply reinforced silicone coupler and 6061-T6 black anodized aluminum flange

Air Box:

• 2X2 twill weave carbon fiber construction
• Gloss finish clear coat for UV resistance
• Mounts in stock location with supplied hardware

Air Filter:

• Conical hi-flow reusable air filter
• 8 ply oiled cotton gauze construction
• Bellmouth (velocity stack) filter flange inlet for reduced turbulence and maximized flow

Enhance your BMW's performance and sound with the Turner Motorsport N54 Valved Catback Exhaust. This exhaust system delivers a dual-purpose experience, offering a subdued note with the muffler valves closed, maintaining a near-factory sound. Open the valves with the included controller, and unleash a menacing growl, transforming your driving experience. Crafted with mandrel-bent dual 2.5" 304SS pipes and a high-flow valved stainless steel muffler, this system is a bolt-on replacement for the OE version, ensuring easy fitment with Accuseal slip-fit joints. Elevate your 335i's exhaust with the Turner Motorsport E9X 335i full exhaust system, available as Axle Back, Cat-back, or Turbo back.

Key Features:

• Dual 2.5" 304SS pipes with brushed finish
• Valved stainless steel muffler for dual-sound experience
• Accuseal slip-fit joints for easy fitment
• Turner Engraved Polished exhaust tips
• Utilizes factory exhaust hangers for straightforward installation

Kit Includes:

• Turner Mid Pipes for factory catted mid pipes
• Turner Valved Exhaust
• Muffler Valve Controller Kit
• Turner Engraved Exhaust Tips
• Gaskets and Nuts

ECS Tuning N54/N55 Cat-Back Exhaust for BMW E9X Take your 335i or 335xi to the next level with a high-performance cat-back exhaust designed to invigorate your driving experience. Constructed from premium brushed stainless steel, this ECS cat-back exhaust isn’t just about cutting weight—it’s about delivering unrestrained performance with a refined, yet powerful tone. Expect a thrilling soundtrack that underscores every shift and acceleration, giving you that much-needed connection to the road.

This exhaust system is crafted with balance in mind, providing a potent sound without the excessive drone that disrupts highway cruising. Designed for the N54 and N55 engines, it integrates seamlessly with both stock and aftermarket downpipes. Featuring twin 2.5” mandrel-bent pipes and turbo-style mufflers, this exhaust offers increased flow, weight savings, and a deep, exhilarating tone that complements the BMW’s high-output turbocharged engine.

Why Upgrade?

Better Sound and Flow: A dual 2.5” mid-pipe setup leads back to lightweight, turbo-style mufflers. Designed for unrestricted flow, the exhaust enhances horsepower, torque, and throttle response. Signature Tips: Complete with dual black chrome 3.5” tips, this system not only sounds incredible but looks the part, too. Weight Savings: Shedding 37% of the weight, this exhaust replaces the heavy factory cat-back and lightens your load to support a sportier feel. Improved Performance: Reduced backpressure for smoother, more responsive acceleration. Precision Engineering

Design Technology: Using FARO ARM laser scanning and SolidWorks 3D CAD, this system is built for an exact fit. High-Quality Materials: T304 stainless steel construction with 1.25mm wall thickness, TIG-welded for durability. OEM Fitment: Stainless steel hangers are welded in OE locations for a seamless, factory-quality installation. Adjustability: Strategic slip joints make adjustments easy, so you achieve the ideal alignment for your setup. What’s Included?

Dual 2.5” mid-pipes and rear exhaust section High-flow turbo-style mufflers Complete mounting hardware and clamps Black chrome 3.5” exhaust tips Turner Motorsport Performance Ignition Coils

Boosted Performance: Enhanced spark energy translates to a stronger and more reliable combustion cycle. Direct Fitment: Engineered for seamless installation with your BMW’s ignition system. Distinctive Turner Blue: Adds a stylish touch to your engine bay, making it look as good as it performs. Benefits at a Glance

Enhanced Exhaust Sound: Deeper, more aggressive note with minimized cabin drone. Lighter Build: 37% lighter than stock for added agility. Free Ignition Coils: Improved spark for consistent performance and fuel efficiency. Performance Ready: Fully compatible with both OEM and aftermarket setups. Turn heads, enjoy the ride, and make the most out of your BMW’s power with this ECS Tuning N54/N55 Cat-Back Exhaust and Turner Ignition Coil combo—built for enthusiasts who demand the best in performance and style.

Engineered for vehicles with vacuum-actuated exhaust valves, the ECS Remote Vacuum Exhaust Valve Control Kit puts you in complete command of your exhaust sound. This fully standalone system lets you open or close your valves instantly—no reliance on factory controls, drive modes, or complicated wiring.

At its heart is a self-contained vacuum pump and dedicated control module, operating entirely independent of your vehicle’s electronics. The result is broad compatibility with both OEM and aftermarket exhaust systems, allowing for the freedom to switch between aggressive performance sounds and a refined, quiet tone at the touch of a button.

Kit Includes:

Standalone Vacuum Pump – Delivers consistent vacuum for reliable valve function

Wiring Harness Options – Choose from a reversible cigarette lighter power adapter or a length of wire for custom hardwiring

High-Quality Vacuum Hose – Durable, leak-resistant construction for long-lasting performance

Remote Controllers – Compact fobs for easy operation from inside or outside the vehicle

Features:

Instant open/close control for exhaust valves

Operates completely independent of factory electronics

Universal compatibility with vacuum-actuated valve systems

Ideal for both aftermarket and factory exhaust setups

From stealthy early-morning starts to unleashing your exhaust’s full roar on demand, the ECS Remote Vacuum Exhaust Valve Control Kit gives you total control over your car’s voice—whenever and wherever you want it.

Why own the only V8-powered M3 if you can’t actually hear it? BMW's E9X M3 features a hefty rear muffler assembly that silences the S65's distinctive soundtrack. While full cat-back systems can require a serious financial commitment, our new Muffler Delete Kit offers an affordable, no-compromise solution that brings your M3 to life!

This system transforms the character of your S65 by replacing the restrictive factory mufflers with a free-flowing, TIG-welded stainless steel assembly designed to amplify tone, shed weight, and preserve OEM fit and finish. Our design features dual 2.5" primary tubing that flows into adjustable 3" quad tips, creating a clean yet aggressive aesthetic. Up front, factory-style V-band flanges connect directly to the OEM midpipe—meaning no cutting of factory exhaust piping. At the rear, Accuseal slip-fit connections allow perfect tip alignment within the factory diffuser, ensuring a tailored, symmetrical look every time.

FEATURES

TIG-welded dual 2.5" primary tubing transitioning into adjustable 3" quad tips for a bold, refined appearance

OE-style V-band flanges for true factory-like integration—no cutting required

Accuseal slip-fit joints for full adjustability and precise tip placement

Utilizes factory hangers for a clean, bolt-on installation with zero drilling or modification

PRODUCT DEVELOPMENT

Our Rear Muffler Delete Kit is the result of advanced engineering, testing, and quality assurance by Turner’s Research & Development team. Every stage of development employs FARO laser scanning, SolidWorks 3D CAD modeling, and in-house rapid prototyping for precise fitment and design validation. Performance and durability are proven through Mustang AWD 500 SE dyno testing and Superflow SF-750 Flowbench analysis, ensuring each component meets Turner’s uncompromising standards for performance and quality.

INSTALLATION & SUPPORT

Need installation guidance? Our R&D team has you covered. A complete, start-to-finish install guide is available HERE.

Lightweight axle-back featuring an exotic exhaust note. Designed for minimal drone at driving speed and maximum volume when desired.

Prepare to give your 335 the boost it deserves. Our axle-back exhaust was made to redefine the driving experience of your E9x. Manufactured from premium brushed stainless steel, it is not just about reducing weight; it's about enhancing performance with unrestricted airflow. And the sound? It's a symphony of power and precision, carefully crafted for an unforgettable soundtrack. The sound experience is more than you could ask for. With the freedom of exhaust flow and tuned exhaust note, we are very excited to get these exhausts on 335's everywhere, don't wait!

In crafting the 335 exhaust systems, the primary focus is achieving the perfect balance of sound and comfort. We understand the desire for a thrilling exhaust note without the annoyance of highway drone or interior vibrations. This ECS exhaust for your 335 incorporates this balance, offering a strategic blend of sportiness and practicality. Drawing from their extensive experience, particularly with N54 and N55 E chassis, they have engineered an exhaust packed with innovative features, compatible with factory and aftermarket downpipes. Experience the perfect blend of performance and everyday usability.

Prepare for a fresh new exhaust, things are about to get rowdy. This ECS exhaust features twin 2.5" brushed pipes with flanges that bolt directly to your factory and aftermarket downpipes. The dual 2.5" mid-pipes make their way toward the rear axle with smooth transitions for effortless exhaust flow. Replacing the large suitcase muffler is a pair of 2.5" turbo-style mufflers that shed weight and give a signature sound. The turbo-style muffler features an inner design that refines the exhaust note to perfection. An extraordinary mixture of both volume and frequency. Paired with the 2.5" mufflers is your choice of 3.5" exhaust tips that give your rear diffuser a sporty look that shouts performance.

Features and Benefits:

Street/Motorsport inspiration
Enhanced exhaust note
33% lighter than stock!
Stock axle-back: 51lbs
ECS axle-back: 34lbs
Reduction in back pressure for increased throttle response, TQ, and HP
Dual 3.5" fitted exhaust tips
Part Design:

In-house designed and engineered using FARO ARM laser scanning technology and SolidWorks 3D CAD modeling for precision fitment.
T304 Stainless Material in a natural finish - 1.25mm wall thickness, back purged, and TIG-welded throughout
Dual 2.5" Stainless Steel Mandrel Bent Tubing
T304 Stainless Steel 12mm barbed exhaust hangers TIG-Welded in OE locations for precise fitment.​
Strategically placed slip joints provide the most adjustability to obtain perfect fitment
Kit Contents:

Dual 2.5" rear section and adapters
2.5" free-flowing mufflers for better sound, and performance
Clamps and Hardware for an OEM+ install
Optional 3.5" ECS exhaust tips