Prepare to give your 1 series the boost it deserves. Our cat-back exhaust was made to redefine the driving experience of your 135. 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 135's everywhere, don't wait!

Sound Clips! Featured on our ECS YouTube Channel HERE: https://youtu.be/c2VETzswwrk?si=xoL0gQQByQY91UVj

In crafting the 135 exhaust systems, our primary focus is on 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. Our exhaust for your 135 incorporates this balance, offering a strategic blend of sportiness and practicality. Drawing from our extensive experience, particularly with N55 cars like the E9x series, we've engineered an exhaust packed with innovative features, compatible with both 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. Our exhaust features twin 2.5" brushed pipes with flanges that bolt directly to your factory and aftermarket down-pipes. The dual 2.5" mid-pipes make their way toward the rear axle and converge into a single 3" exhaust section. The 3" exhaust section snakes through the rear section of the car making smooth dips and curves to make its way into a light-weight 3" turbo style muffler. Don't be fooled by our 135 muffler, the size is nothing but deceiving. 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 3" muffler is your choice of 3.5" exhaust tips that give your rear diffuser a sporty look that shouts performance. 

Although both N54 and N55 share identical exhaust geometry, the N55 mid-pipes do not feature secondaries. Though the N55 cat-back is compatible with N54 downpipes this is not suggested. Hypothetically, our N55 catback sounds absolutely glorious on an N54, even with aftermarket downpipes. 

Features and Benefits: 

• Street/Motorsport inspiration
• Enhanced exhaust note
• Full exhaust replacement
• 25% lighter than stock!
  • Stock cat-back: 56lbs
  • ECS cat-back: 42lbs
• 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
• 3" Rear exhaust section
• 3.0" free-flowing muffler section for better sound, and performance
• Clamps and Hardware for an OEM+ install
• Optional 3.5" ECS exhaust tips 

Product Development:

• Our ECS 135 exhaust upgrades were designed, engineered, tested, and quality inspected by our Research and Development team in our Wadsworth, Ohio facility. We strive for the highest level of precision and quality through leading-edge product development technology including FARO laser scanning for reverse engineering and quality inspection, SolidWorks 3D CAD modeling, and rigorous long-term product testing.

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