BMW Exhaust Parts, Mufflers & Catalytic Converters

Looking to elevate the acoustics of your X3 M40i / X4 M40i with an exhaust system that not only offers a much-improved sound while retaining the flexibility associated with valves, but also raises the eye appeal beyond the mundane? Look no further than the Dinan valved cat-back to meet all your needs… and then some! 

The full cat-back requires no cutting and utilizes factory mounting locations that allow the Dinan exhaust system to be a straightforward and painless install. Fabricated from brushed 100% T304 stainless steel, TIG welded, and free of hydroformed pipe, the upgraded system is also a marked improvement from its predecessor - both in terms of material/construction as well as in overall looks. The most glaring change being the replacement of the OEM dual slip tips in favor of an M-inspired quad tip configuration. Despite the limited room, Dinan was determined to offer four individually functioning pathways/tips and not lessen the representation with Y-tips or other gimmickry.  The result is a proper quad setup furnished with cavity covering 3.75-inch (95mm) tips in either black ceramic or polished stainless ensuring the system can be appreciated even before it is heard.

While looks are important, the auditory advantages are what any enthusiast is truly after with an exhaust system, and the Dinan offering for the G01/G02 M40i platform delivers in spades. For not only aural enhancement via the elimination of the central collector/resonator, but also weight savings and simplicity. The stock single-to-dual pipe setup has been abandoned in favor of an enlarged, straight, unrestricted, and freer-flowing single pipe system. This pathway feeds into a Helmholtz-equipped muffler that limits frequencies associated with drone, as well as assists in altering the overall tone of the setup to deliver the signature low Dinan rumble. The no-nonsense design allows versatility in volume levels with the retained factory valve functionality. Go from refined when cruising (low RPM’s) to rowdy when in it (high RPM’s), with ease. Or better yet, pair the system with an exhaust valve remote and have full control of elevating or reducing the sound! When open, the system behaves as a straight pipe solution that promotes maximum flow and volume for an exhilarating and forceful chorus. When the valve is closed, however, exhaust gases are wholly redirected through the muffler and emit more tempered vocals acceptable for even the most sensitive ears. It is the perfect blend of civility when cruising or the full spectrum of auditory delight when in the throttle. No matter the situation, the Dinan valved cat-back exhaust system is the answer for the discerning enthusiast looking for sound without sacrifice.

Features:

Maximum gains of +6 HP and +5 lb-ft of torque

Enjoyably louder, sportier sound w/ a delightful octave drop

Drone abatement technologies used to reduce cabin resonance

Quad 3.75-inch (95mm) double-walled, polished (or black ceramic coated) clamp-on tips with laser engraved Dinan logo

Larger diameter piping for increased flow (83mm vs. 80mm) 

Factory resonator/collector removed for increased volume

7-pounds lighter than the stock system (60-pounds vs. Dinan: 53-pounds)

100% 304 Stainless Steel construction

Factory valve functionality retained; refined or rowdy from the same exhaust

Direct bolt-on w/ no cutting or welding required

Factory-like fitment with included mounting hardware and valve componentry for both pre-LCI and LCI compatibility

Bring out the full power and sound of your supercharged W11 engine with the ECS Tuning cat-back exhaust. Engineered for precision fitment on all R52 and R53 Cooper S models, this system blends lightweight construction, durable materials, and a sound profile that evolves with your driving.

During daily driving, the system produces a smooth, deep tone. Push harder, and it rewards with crisp pops and burbles that perfectly suit the MINI’s playful character.

In-House Engineered:

Developed In-House – Designed, tested, and inspected at our Wadsworth, Ohio facility using FARO ARM laser scanning, SolidWorks 3D CAD modeling, and rigorous long-term validation.
2.5" T304 Stainless Steel Tubing – CNC mandrel-bent with a brushed finish and 1.25mm wall thickness for maximum strength, flow, and corrosion resistance.
Straight-Through Turbo-Style Muffler – In-house engineered with a perforated core and stainless steel wool packing. Aggressive sound under throttle, refined tones at cruise.
Adjustable Dual 3.5" Tips – 10mm of vertical adjustment for a perfect rear valance fit.
TIG-Welded & Back-Purged – Meticulously assembled for long-term durability and an art-like finish.
Installation & Fitment Features

Factory-Style Mounting – Fabricated sheet metal brackets for strength and OE-like reliability.
Slip Joints – Allow maximum adjustability for perfect fitment on every car.
T304 Stainless Barbed Hangers – Corrosion-resistant and designed to last.
Optimized for Ground Clearance – Perfect for lowered or track-focused builds.
Resonated & Non-Resonated Sections – Choose your preferred balance of tone and volume.
Fits Early & Late Models – Includes brackets for both ’02–’04 and ’05–’06 production years.
Convertible Compatible – Designed with clearance for the R52 rear brace.
Performance Gains & Weight Savings

This system is not only stronger and better-sounding than stock, it’s also lighter:

OEM Exhaust: 41.5 lbs
ECS Exhaust (Resonated): 30 lbs
ECS Exhaust (Non-Resonated): 27.5 lbs
Key Design Features

Single muffler, dual center-exit design
2.5" / 63.5mm stainless tubing throughout
Turbo-style straight-through muffler (2.5" in / 2.5" out)
Fabricated sheet metal mounting brackets
Stainless Accuseal clamps included
All required hardware included
Installation & Support:

Installing your ECS cat-back is straightforward, simply unbolt the factory unit, position the new system, and assemble.

Step-by-step instructions are available Here:
Recommended tool: Exhaust Hanger Removal Pliers (T#:379176) for easier disassembly.
More than just an exhaust, this is a performance-driven upgrade that enhances your MINI’s sound, style, and response. Lightweight, precision-built, and backed by our in-house R&D, the ECS cat-back delivers a soundtrack that adapts to your driving mood — from comfortable cruising to spirited acceleration.

Unleash your MINI’s full personality with a cat-back system that looks as good as it performs.

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

Dinan sport mufflers are designed to compliment the M3 and not overpower the driver and passengers with harsh tones. Dinan engineers their exhausts to sound great and be a natural fit to the character of the car as well as produce more power and torque. Four 3.5" black ceramic tips engraved with the Dinan logo fill out the rear valence (choose either polished or satin black tips). Annoying highway drone has also been engineered out of the system. Dinan uses only 304 stainless steel in their systems for the maximum corrosion protection. This system replaces the factory rear mufflers at a pre-determined cut point on the stock exhaust, which makes for an easy installation and you can reinstall your original mufflers using factory hardware. Detailed installation instructions are included.

Features of the F9X M3 Dinan Exhaust -

• Single channel design
• Sportier Sound
• 10 lbs lighter than stock part + 100% 304 stainless steel construction
• Simple installation using high quality BMW OEM clamps and hangers
• Quad 3" laser engraved black ceramic coated exhaust tips with Dinan logo
• 6 HP & 5 lb-ft of torque
• "Straight Through" canister design
• Helmholtz chamber to remove drone

For over 35 years, Dinan has been America's premier tuning company, pioneering advancements in BMW modification while retaining a focus on balanced performance that preserves the original character and driving feel that a BMW offers. When you install a Dinan part on your car, know that it's not only carefully developed and tested, but that Dinan stands behind it with a four year, 50,000-mile warranty. Dinan believes so fully in their “total package” approach that once your car has been fitted with enough of their parts, they celebrate your conversion from stock to Dinan with an exclusive trunk badge, displayed proudly by BMW enthusiasts everywhere. This setup is worth 3 point towards your Dinan badge.

This item fits the following BMWs:
2008-2013 E92/3 BMW M3

Lightweight and well-balanced, this exhaust delivers a deep, low-frequency tone for daily driving, while unleashing exciting pops and burbles under spirited throttle.

Engineered with precision and crafted for enthusiasts, the ECS Tuning Cat-Back Exhaust System for the MINI Cooper S and JCW delivers a true blend of performance, aesthetics, and acoustic refinement. Whether you’re carving corners or cruising the highway, this system transforms your MINI’s character while maintaining real-world usability.

From the first drive, the system delivers a distinctly refined but sporty soundtrack. In non-sport mode, it produces a deep, bass-heavy tone that’s civil around town. Switch into sport mode, and the sound comes alive with pops and burbles that add excitement without overwhelming the cabin. Highway drone is kept to a minimum.

Features and design:

Developed In-House using FARO ARM laser scanning and SolidWorks 3D CAD to ensure precision fitment and unmatched consistency.
2.5" T304 Stainless Steel Tubing: CNC mandrel bent with a brushed finish and 1.25mm wall thickness for strength, longevity, and flow.
Straight-Through "Turbo Style" Muffler: In-house engineered with a perforated core and stainless steel wool packing for aggressive sound under throttle, while maintaining refined tones at cruise.
Adjustable Exhaust Tips: Offers 10mm of vertical adjustment for perfect rear valance alignment.
Tig-Welded & Back-Purged: Each system is meticulously assembled for long-term durability and a clean, art-like finish.
Installation & Fitment Features:

Fabricated Sheet Metal Brackets: For factory-style mounting and long-term reliability.
Exhaust Hanger Locking Collars: Ensure the system stays aligned within your rear diffuser.
Slip Joints: Strategically placed to maximize adjustability for perfect fitment on every car.
T304 Fabricated Stainless Steel Barbed Hangers: Strong, corrosion-resistant, and designed to last.
Optimized for Ground Clearance: Perfect for lowered or track-oriented cars.
This cat-back is more than just an exhaust; it’s a performance-driven upgrade designed to enhance your MINI’s sound, style, and response. Lighter than the OEM system and meticulously engineered, it delivers a soundtrack that evolves with your driving mode while maintaining comfort for long-distance trips. Unleash your MINI’s full personality with a cat-back that looks as good as it performs.

Fitment:

MINI Cooper S & JCW
R56 Hatchback (2007–2013)
R57 Convertible (2009–2015)
R58 Coupe (2012–2015)
R59 Roadster (2012–2015)
Fits both N14 and N18 engine variants.
Installation and Support:

Installation is as easy as cutting, placing into position, and clamping!
Instructions are featured in the "Installation" tab above product details
Tools you might want for the job:
Exhaust hanger removal pliers - T#:379176
Exhaust pipe cutter - T#:385451
Product Development:

The ECS Tuning exhaust was designed, engineered, tested, and quality inspected by the Research and Development team in our Wadsworth, Ohio facility. ECS strives 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.

Looking to elevate the acoustics of your X3 M40i / X4 M40i with an exhaust system that not only offers a much-improved sound while retaining the flexibility associated with valves, but also raises the eye appeal beyond the mundane? Look no further than the Dinan valved cat-back to meet all your needs… and then some! 

The full cat-back requires no cutting and utilizes factory mounting locations that allow the Dinan exhaust system to be a straightforward and painless install. Fabricated from brushed 100% T304 stainless steel, TIG welded, and free of hydroformed pipe, the upgraded system is also a marked improvement from its predecessor - both in terms of material/construction as well as in overall looks. The most glaring change being the replacement of the OEM dual slip tips in favor of an M-inspired quad tip configuration. Despite the limited room, Dinan was determined to offer four individually functioning pathways/tips and not lessen the representation with Y-tips or other gimmickry.  The result is a proper quad setup furnished with cavity covering 3.75-inch (95mm) tips in either black ceramic or polished stainless ensuring the system can be appreciated even before it is heard.

While looks are important, the auditory advantages are what any enthusiast is truly after with an exhaust system, and the Dinan offering for the G01/G02 M40i platform delivers in spades. For not only aural enhancement via the elimination of the central collector/resonator, but also weight savings and simplicity. The stock single-to-dual pipe setup has been abandoned in favor of an enlarged, straight, unrestricted, and freer-flowing single pipe system. This pathway feeds into a Helmholtz-equipped muffler that limits frequencies associated with drone, as well as assists in altering the overall tone of the setup to deliver the signature low Dinan rumble. The no-nonsense design allows versatility in volume levels with the retained factory valve functionality. Go from refined when cruising (low RPM’s) to rowdy when in it (high RPM’s), with ease. Or better yet, pair the system with an exhaust valve remote and have full control of elevating or reducing the sound! When open, the system behaves as a straight pipe solution that promotes maximum flow and volume for an exhilarating and forceful chorus. When the valve is closed, however, exhaust gases are wholly redirected through the muffler and emit more tempered vocals acceptable for even the most sensitive ears. It is the perfect blend of civility when cruising or the full spectrum of auditory delight when in the throttle. No matter the situation, the Dinan valved cat-back exhaust system is the answer for the discerning enthusiast looking for sound without sacrifice.

Features:

Maximum gains of +6 HP and +5 lb-ft of torque

Enjoyably louder, sportier sound w/ a delightful octave drop

Drone abatement technologies used to reduce cabin resonance

Quad 3.75-inch (95mm) double-walled, polished (or black ceramic coated) clamp-on tips with laser engraved Dinan logo

Larger diameter piping for increased flow (83mm vs. 80mm) 

Factory resonator/collector removed for increased volume

7-pounds lighter than the stock system (60-pounds vs. Dinan: 53-pounds)

100% 304 Stainless Steel construction

Factory valve functionality retained; refined or rowdy from the same exhaust

Direct bolt-on w/ no cutting or welding required

Factory-like fitment with included mounting hardware and valve componentry for both pre-LCI and LCI compatibility