BMW Catback Exhaust Systems 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