Evolution Racewerks Sports Series High Flow Catted Downpipe - BMW / N55 / M135i / M235i / 335i / 435i | BM-EXH007SCAT

Ease of Installation: (1 Easy, 5 Hard) 2

Installation Guide

Parts Checklist

Key Features:

• Available for the 2012+ BMW 335i (F30 Chassis) N55 Engine!
• Available for the 2013+ BMW 435i (F32/F33 Chassis) N55 Engine!
  
• Available for the 2012+ BMW M135i (F20/F21 Chassis) N55 Engine!
• High Flow 200 cell metallic catalytic converter 
• Higher Max Horsepower Power Curve
• Higher Initial Torque Curve.  Torque curve hits faster, 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
• Brush Finish (standard) or optional Polish Finish
  
• Available with high temperature Black Thermal Coating to reduce under hood 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
• Made in the USA!

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 catalyzer 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 easily. 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.

Our Sports Series Catted 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 4" V-Band flange which we have duplicated and CNC machine 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. Since the outlet of the turbocharger is 4" and the factory exhaust system is 2.5", the factory downpipes reduces size using short transitions from 4" before the catalytic convert and 2.5" afterwards.  Due to space needed for the catalytic converter, the factory downpipes reduce in size using very short transitions. Since our catted downpipes utilize a more compact catalytic converter, we have more space. Thus, we use very long transitions. These longer transitions allow the exhaust gas time to smoothly transition from the larger piping to the smaller. This results in less exhaust turbulence and backpressure which again improves throttle response and increase turbocharger spool times (less turbocharger lag).

Our downpipes are designed to fit perfectly with either the factory exhaust system or your aftermarket exhaust system.  There are no compatibility issues whatsoever. The downpipes will come by default in Brushed Finish. We also offer a Polished Finish as an option.

MODEL YEAR:

BMW made two versions of the factory downpipe for the new F Series N55 Engine. The early version ran from build date 2012 to 08/2013. The second version ran from build date 09/2013 and on. The build date of your car can be found on a sticker on the driver's side door jam. These downpipes are not interchangeable. Make sure you order the correct downpipe for your car.

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