Sports Series 4" High Flow Catted Downpipe for N20 Engine


Sports Series 4" High Flow Catted Downpipe for N20 Engine

from 895.00

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 2012+ BMW 328i/320i/428i/420i N20 Engines!

  • High Flow 200 cell metallic catalytic converter used.

  • 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 4" 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.

  • Stainless steel flex section like factory that allows proper exhaust movement and flexibility.

  • Mirror polish or brush finish

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

  • Optional - Additional O2 sensor bung for wideband O2 sensors (comes with pre-installed plug)

  • Optional EGT sensor bung for EGT gauges (comes with pre-installed plug)

  • 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 Sports Series 4" High Flow Catted Downpipe, more power is unleashed! 

The factory catalyter uses a 400 cell ceramic core.  What the 400 cells means is that per every inch, there are 400 "cells" that the exhaust gas must pass through.  We use a 200 cell metallic core.  By having less cells per square inch, these individual "cells" are bigger in size thus allowing exhaust gas to pass through it more easier.  Thus, the lower the cell count, the higher the flow.  Higher flow = more power, faster turbo spool up (less turbocharger lag) and better throttle response.  Bottom line, faster.  The benefits of a metallic catalytic converter vs a ceramic like the factory is that it can take more heat and is more durable (last longer).  They are also lighter than their ceramic counterparts.

Add'l 02 Sensor Bung:
EGT Bung:
Add to Cart