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VEHICLE TYPE: 2012-2015 BMW F20 F21 M135i / 2013-2016 BMW F22 F23 M235i / 2016-Present BMW F87 M2 / 2013-2016 F32 F33 435i N55 Engine Models SURFACE FINISH: Brushed Silver MATERIAL: T-304 Stainless Steel TYPE: Race Cat Downpipe DIAMETER: 4 Inches Restrictions in the exhaust system rob horsepowe...
2012-2015 BMW F20 F21 M135i / 2013-2016 BMW F22 F23 M235i / 2016-Present BMW F87 M2 / 2013-2016 F32 F33 435i N55 Engine Models
SURFACE FINISH: Brushed Silver
MATERIAL: T-304 Stainless Steel
TYPE: Race Cat Downpipe
DIAMETER: 4 Inches
Restrictions in the exhaust system rob horsepower and torque especially on turbocharged cars. Thus, removing as many 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 its 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 Extreme Online Store Competition Series 4" Race Cat Downpipe, more power is unleashed and You will feel the difference instantly.
Our Competition Series Race Cat Downpipes is constructed out of 100% 304-grade stainless steel and utilizes 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 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. Since the outlet of the turbocharger is 3.5" and the factory exhaust system is 3", the factory downpipes reduce size using short transitions from 3.5" before the catalytic convert and 3" afterward. Due to the space needed for the catalytic converter, the factory downpipes reduce in size using very short transitions. Since our Race Cat downpipes delete the 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. Also, since we utilize a larger 4" pipe right after the turbocharger, turbo back pressure is significantly reduced. This results in less exhaust turbulence and backpressure which again improves throttle response and increases turbocharger spool times ( less turbocharger lag ).
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