Custom Performance Engineering

CP-E QKspl Downpipe w/ High Flow Cat | 2015+ Ford Mustang Ecoboost (FDDP00006T)

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QKspl Downpipe w/ High-Flow Cat for 2015+ Mustang Ecoboost by CP-E

Matching the stock turbo, our downpipe includes a laser cut turbo flange designed to fit flawlessly with stock Mustang turbo flange. Our downpipe is crafted from premium American made “bright annealed” 304 stainless steel and is mandrel bent throughout for less turbulent exhaust flow. We have included three O2 bungs to accommodate the two stock O2 sensors, and to give the ability to easily add a wideband sensor. We offer an optional high flowing catalytic converter that features a metallic monolithic honeycomb catalyst designed for maximum flow and surface area. For those that opt-out of the high flowing cat, the off-road downpipe will include a cp-e™ Smart O2 Simulator to help eliminate the unwanted check engine light.

Also helping to accommodate the stock mounting, cp-e™ has designed this downpipe to use the stock downpipe support mount by welding a laser cut stainless steel bracket onto each downpipe. This braket mounts the downpipe securely and provides the extra support needed to make it last a lifetime. cp-e™ has taken the extra step to supply a custom laser cut gasket with the downpipe to mate to the stock turbo completely leak-free. On the outlet end of the downpipe, we have created a slip joint that allows the installer to mate it to the stock exhaust or a full 3.00” exhaust. This adapter allows the customer to buy a true full 3.00” downpipe instead of being limited to a downpipe that needs to neck down at the flange. This gives the smoothest transition to either exhaust size, and gives the option of “upgrading down the road”. Now you can have a full 3.00” downpipe without sacrificing on what exhaust you have.

Finally, the downpipe features the all-new finish from cp-e™. This satin finish not only gives a uniform clean finish throughout, but also strengthens the stainless steel and the welds for added reliability. Made in the U.S.A. and backed by a lifetime warranty, all your bases are covered.• More than 5% gains in upper RPMs


  • No power loss in lower RPMs
  • CNC-lathe V-Band turbo flange
  • Extra O2 bung for adding a wideband sensor
  • Laser cut stainless steel bracket
  • Laser cut stainless steel exhaust gasket adapter
  • Industry-leading stainless steel flex joint
  • Metallic honeycomb high flow cat
  • Mount to 2.50” or 3.00” exhaust flanges with no exhaust leaks
  • Full 3.00” mandrel bent 304 stainless steel
  • Included Smart O2 Simulator with Off-Road Downpipe


  • 2015+ Ford Mustang Ecoboost

What's In The Box?

  • 1 - QKspl Catted Downpipe
  • Necessary Hardware



CP-E Limited Lifetime Warranty

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