N54 cp-e QKspl™ Downpipes BMW (e82) 1-Series 2008+

cp-e (Custom Performance Engineering)

$ 579.99 $ 682.40

Eliminating restrictions in the exhaust system is key to increasing efficiency and power. Back pressure causes delayed turbocharger response and is a bottleneck.



  • CAM/CAD Engineering
  • Full 304 Stainless construction
  • Cast bellmouths for smooth transitions
  • Mandrel bent tubing
  • Laser cut flanges
  • TIG welded
  • Available with High Flow Catalytic converters
  • Optional Wideband O2 bungs available
  • Made in the USA
  • Lifetime Warranty

cp-e™ cast stainless downpipes have been designed specifically for the n54 motors to reduce back pressure and optimize exhaust flow.
+12whp +10wtq

CAD designed castings channel the gas from the twin turbos into mandrel bent tubing – as a result there are no harsh bends or transitions restricting flow. Made completely of high grade 304 Stainless steel, the system is strong and durable.

The ultra-precise fitment of the downpipes is the result of painstaking attention to detail and the utilization state-of-the-art manufacturing equipment. cp-e™ utilizes the latest in 3-D digitizing and reverse-engineering tools, and also take advantage of robotic cutting and welding systems to reduce the influence of human error. These tools ensure that each example is true to the original prototypes, which guarantees ideal fitment each and every time.

The downpipes may be installed without any permanent modifications, and are available with or without high-flow catalytic converters and additional wideband oxygen sensor bungs.

This item fits the following BMWs with the N54 engine:
2008-2012 E82 BMW 135i 1M Coupe
2006-2011 E90 BMW 335i 335xi 335i xDrive - Sedan
2007-2013 E92 BMW 335i 335is 335xi 335i xDrive - Coupe
2007-2013 E93 BMW 335i - Convertible
Left Hand Drive ONLY

Plug in some speakers with some bass and turn it up!

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