cp-e™ QKspl™ 5″ Cast Stainless BMW B48 Catted Downpipe

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The cp-e™ 5″ cast stainless downpipe has been designed specifically for the N55 engines to minimize back pressure in the collector and optimize exhaust flow.

Also available without a catalytic converter.


SKU: BMDP00004T Categories: , , ,

BMW B48 Catted Downpipe

Excessive back pressure in the exhaust system can cause delayed turbocharger response. Eliminating restrictions in the exhaust system is key to increasing engine efficiency and power.

Does not fit the European model

BMW B48 Catted Downpipe FEATURES

  • CAM/CAD Engineering
  • CNC Machined Castings
  • Full 304 Stainless construction
  • Perfect Fit
  • Cast bellmouth for a smooth transition
  • TIG welded
  • Available with custom cp-e™ designed High Flow Catalytic converter
  • Standard Wideband O2 bung included
  • EGT bung included
  • Made in the USA
  • Lifetime Warranty

The cp-e™ 5″ BMW B48 Catted Downpipe has been designed specifically for the B48 engines to minimize back pressure in the collector and optimize exhaust flow.

We used our FARO CMM (Faro Technologies Coordinate Measuring Machine) to design the downpipe. With our CMM we were able to digitize the model and keep within .010” of the stock flanges and mounting points. In addition to the downpipe being designed in CAD, our fixtures for the manufacturing of the downpipe were also designed in CAD. The fixtures were then laser cut and CNC machined to assure precise fitment, every time.

This extensive process is nearly impossible to replicate with a hand fabricated part.

The 5″ downpipe may be installed without any permanent modifications, and is available with or without a cp-e™ custom designed high-flow catalytic converter.

While this may not trip a Check Engine Light, we cannot guarantee that all of the codes will be in the “ready” state.

BMW B48 Downpipe Highlights

OEM Fit & Finish

The BMW B48 Downpipe is designed to fit your OEM mid pipes or cp-e Quickpower pipes. This perfect OEM fitment allows you to modify your exhaust at your own pace and replace the mid pipes with the downpipe, or at a later time.

Full 5″ Design

The CAD designed castings on both ends of the downpipe are designed to work with a 5” diameter center section. This will be available with and with out a catalyst. The entire system (castings and tube) is made from 304 stainless steel.

Not California exhaust compliant | No implied CARB certification | Off-road use only

CALIFORNIA WARNING:Cancer and Reproductive Harm – www.P65Warnings.ca.gov

Weight 16 lbs
Dimensions 22 x 22 x 8 in


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