BMW Catback Exhaust Systems for BMW E90 M3 S65 4.0L

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Catback Exhaust systems are designed to completely replace everything from your cats all the way back to your exhaust tips. Traditionally, if you are planning on upgrading your entire exhaust system, you will also need headers and downpipes.
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Milltek Sport - Corporate Logo
T#:380505
Part#: SSXBM941
Ships on Oct 28, 2026
$ 1,948.99 USD
Free Shipping
$ 1,948.99 USD
Free Shipping
With in-house production and engineering in the United Kingdom, they have been designing and developing exhaust systems for over 32 years. This experience has helped put Milltek on the map when it comes to performance exhausts, with offerings that range from Audi/Volkswagen to Porsche, BMW, and even Bentley. But, they don't stop there. Milltek has also made its presence felt in the motorsport community. Through partnerships with various race teams throughout the world, Milltek has gathered feedback on ways to improve their systems from enthusiasts at every level. Constructed of type-304 aircraft grade stainless steel, the quality is top-notch. To take it a step further, Milltek offers a lifetime warranty to the original purchaser.
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Active Autowerke - Corporate Logo
T#:397446
Part#: 11-015
Ships in 3 Business Days
$ 1,519.99 USD
$ 1,519.99 USD

True performance, durability, and attractive weight advantages with innovative features places the Active Autowerke E9X BMW M3 exhaust in a class of its own. This system is constructed from 100% 304-stainless steel and features adjustable Active Autowerke double walled tips, making it ideal both for 2-door and 4-door models (also allows for cleaner fitment with diffusers).

This system uses factory style flanges making it a complete bolt on system that requires no cutting or welding. The system is a straight-through design providing substantial improvements to gas flow over the factory exhaust.

The sound is unobtrusive, with a rich mellow tone and delivers a solid 5+hp, with key gains in the mid-range. In addition, the Active Autowerke E9X M3 Signature Exhaust system features large 3" piping for maximum exhaust flow while maintaining enough back-pressure to result in horsepower increases across the entire RPM range.

The factory E9X M3 muffler features a Noise Canceling Chamber inside the muffler and Active Autowerke has retained this feature by adding two custom Active Autowerke noise canceling chambers (NCC)on each muffler to reduce/minimize the drone (the 'booming' noise some muffler emit at cruising speeds, ~3500 rpm).

The Active Autowerke E9X M3 Signature Exhaust System provides increase in horsepower, great sound and appearance making it a must for the true M3 enthusiasts.


Features:

  • Large 3-inch mandrel bent piping for maximum flow 
  • Durable, 100% 304 brushed stainless steel 
  • Double-walled 76mm Signature stainless tips
  • Revolutionary NCC -Noise Cancelling Chamber 
  • Adjustable Tips with Embossed Active Autowerke Logo
  • Improved power & torque throughout entire RPM band 
  • Gains of 5+ HP over stock configuration; Additional HP with our programmed software 
  • BMW factory style hardware makes a truly easy installation with no need for cutting or re-welding 
  • Weighs 40 Lbs vs. the factory of 55.1 Lbs.
  • Complete illustrated instruction manual
  • Two year warranty
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Milltek Sport - Corporate Logo
T#:380500
Part#: SSXBM931
Ships on Oct 28, 2026
$ 1,924.99 USD
Free Shipping
$ 1,924.99 USD
Free Shipping
With in-house production and engineering in the United Kingdom, they have been designing and developing exhaust systems for over 32 years. This experience has helped put Milltek on the map when it comes to performance exhausts, with offerings that range from Audi/Volkswagen to Porsche, BMW, and even Bentley. But, they don't stop there. Milltek has also made its presence felt in the motorsport community. Through partnerships with various race teams throughout the world, Milltek has gathered feedback on ways to improve their systems from enthusiasts at every level. Constructed of type-304 aircraft grade stainless steel, the quality is top-notch. To take it a step further, Milltek offers a lifetime warranty to the original purchaser.
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Milltek Sport - Corporate Logo
T#:46409678
Part#: SSXBM1408
Ships on Oct 28, 2026
$ 3,889.99 USD
$ 3,889.99 USD
Deciding on the right exhaust should include a blend of considerations: performance, quality, note, and style. The Milltek performance catback is a fantastic blend of these considerations. The performance and quality are top tier, with a note that is quite balanced. The system is constructed from aircraft-grade stainless steel that is beautiful to look at. These features and characteristics make the Milltek performance catback a great option. With in-house production and engineering in the United Kingdom, they have been designing and developing exhaust systems for over 32 years. This experience has helped put Milltek on the map when it comes to performance exhausts, with offerings that range from Audi/Volkswagen to Porsche, BMW, and even Bentley. But, they don't stop there. Milltek has also made its presence felt in the motorsport community. Through partnerships with various race teams throughout the world, Milltek has gathered feedback on ways to improve their systems from enthusiasts at every level. Constructed of type-304 aircraft grade stainless steel, the quality is top-notch. To take it a step further, Milltek offers a lifetime warranty to the original purchaser.
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