Competition Series Catless Downpipes M3/M4 S55 Engine


Competition Series Catless Downpipes M3/M4 S55 Engine

from 1,195.00

CAUTION: This product is intended for OFF ROAD COMPETITION USE ONLY. Not legal for use on pollution controlled vehicles upon public road/highways. THIS PRODUCT IS FOR SALE FOR ALL 49 STATES EXCLUDING CALIFORNIA.  In addition to vehicle use verification, a Vehicle Compliance Waiver needs to be signed.


The item is for sale for international customers without restriction.

Ease of Installation: (1 Easy, 5 Hard) 3

Key Features:

  • Now available for the 2015+ BMW M3/M4 S55 Engines!

  • Higher Max Horsepower Power Curve

  • Higher Intial Torque Curve.  Torque curve hits faster and higher and longer.

  • Better throttle response and faster turbo spool up times

  • Mandrel Bent 3" piping.  Smooth transition to the exhaust system.

  • 100% Stainless Steel Construction

  • 100% TIG welded for better quality welds

  • Precision CNC machined turbocharger V-Band flange

  • Retains factory donut style gasket

  • Mirror polish or brush finish

  • Available with high temperature black thermal coating to reduce underhood temperatures

  • Compatible with the factory or aftermarket exhaust systems

  • Track tested durability

  • Includes all hardware for complete installation

  • Limited Lifetime Warranty

Restrictions in the exhaust system robs horsepower and torque especially on turbocharged cars. Thus, removing as much exhaust flow restrictions will increase horsepower and torque significantly. The factory catalytic converter found in the factory downpipe is a big culprit of this and is a major exhaust flow restriction. The factory catalytic converter is made up of catalyst material formed into "honeycomb" weaves. Exhaust gas must pass through these tiny "honeycomb" weaves on their way to the exhaust system thus causing a major exhaust flow restriction. It also causes turbulence after the catalytic converter which causes the exhaust flow to slow down (which increases restriction). By replacing the factory downpipe/catalytic converter with our Competition Series Catless Downpipe, more power is unleashed! You will feel the difference instantly. 

Our Competition Series Catless Downpipes is constructed out of 100% 304 grade stainless steel and utilize mandrel bent piping. They are 100% TIG welded by our in house fabricators and built in the USA. The factory turbocharger turbine housing utilizes a 3.5" V-Band flange which we have duplicated and CNC machined cut out of billet 304 stainless steel. Stainless Steel CNC machined O2 sensor and laser cut brackets are TIG welded using stainless steel rods. The O2 sensor is positioned at the factory location. The factory donut flange design is retained.  100% bolt on.

Our downpipes are designed to fit perfectly with either the factory exhaust system or your aftermarket exhaust system. There are no compatibility issues whatsover. The downpipes will come by default with brushed finish.

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