2012-21 BMW F-Chassis M135i M2 M235i 335i 435i Catless Downpipe

2012-21 BMW F-Chassis M135i M2 M235i 335i 435i N55 Engine Race Cat Downpipe 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 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 rest