Rear Diffuser

Looking to increase the visual appeal of your BMW M5? This Carbon Fiber rear diffuser is a great way to give your BMW that extra sporty styling you crave!

This diffuser is made by Genuine BMW so high quality and perfect fitment are guaranteed!

To keep wind drag on the rear end of your E90 335i, HARD Motorsport has developed their lightweight Aluminum Rear Diffuser Kit. It reduces undercar drag, allowing for optimal downforce.

Diffuser is unpainted and does not work with stock exhaust. Straight pipes or custom exhaust work recommended.

Fits the following vehicles:

2006-2013 E90 BMW 335i 

Performance Cat-Back Exhaust - E82/E88 135:

Lightweight cat-back featuring an exotic exhaust note. Designed for the perfect blend of performance and functionality!

Prepare to give your 1 series the boost it deserves. This 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!

Featured on the ECS Tuning YouTube Channel!

When crafting the ECS exhaust systems, their primary focus is on achieving the perfect balance of sound and comfort. ECS's understand the desire for a thrilling exhaust note without the annoyance of highway drone or interior vibrations. The exhaust for your 135 incorporates this balance, offering a strageic blend of sportiness and practicality. Drawing from their extensive experience, particularly with N55 cars like the E9x series, they have 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. This 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 the 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 tone and volume. 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. Supposedly this 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

Textured Black Rear Diffuser - E82/E88 M-Sport:

Presenting the ECS rear diffuser tailored exclusively for your 1 Series – a fusion of both aftermarket and factory styling. Rarely does one find a design that not only encapsulates every curve and contour of a vehicle but elevates its overall aesthetic with a single, impactful addition. Amongst the limited options available for the 1 Series, the engineers at ECS have risen to the challenge of providing aftermarket support for these perfectly sized vehicles.

The diffuser replaces the mundane factory M Sport diffuser with a perfectly fitting alternative, designed to enhance the rear end of the 1 Series. Using the existing factory hardware and tab mounting locations, a transformation is merely a few screws and a plastic trim tool away. During the prototype phase, an impressive fit and finish were achieved, but their commitment to excellence led them to make further refinements. With the updated design, the ECS diffuser is now polished to perfection, an indication of the craftsmanship invested in each product.

Installation is a breeze, requiring no drilling, cutting, or modifications of any kind. Simply remove the current valance, align the tabs, and effortlessly secure the diffuser in place using the factory mounting locations and hardware. Ensure a snug fit by verifying the alignment of all tabs, and with a gentle press, witness the tabs seamlessly click into position.

For those with a 1 Series, anticipate a wave of excitement as a range of exhaust options tailored to all motor variants, including the N52, N54, and N55, are unveiled.

Features and advantages:

Transformative Enhances the rear aesthetic of the 1 Series Direct fit utilizing factory clip locations and hardware Available in Textured Matte Black and Gloss Black Crafted from lightweight, vacuum-formed UV-stabilized gloss black ABS polymer Compatible with both E82 and E88 models equipped with the M-Sport Package