VRSF 4" Catted Downpipe - BMW M235i / 335i / M2 N55 (Brushed)The factory downpipe on the N55 is a restriction that limits what these cars can do. The VRSF 4" Catted Downpipe replaces it with a high flow 200 cell race cat unit, reducing back pressure and delivering 20-25 horsepower gains with a tune, while keeping a catalytic converter in place for street use. Hand-crafted from SS304 stainless steel with CNC precision machined flanges throughout.Important: M135i and 335i models produced after 07/2013 require this 4" version. All M235i and 435i models also require the 4" version. Check your turbo wastegate location or contact us with your last 7 VIN digits to confirm.ModsDirect supplies this downpipe to BMW enthusiasts across Australia as an authorised VRSF dealer. Genuine product, full warranty, fast nationwide delivery.What You Get 20-25hp gains with a tune Hand-crafted, tig welded SS304 grade stainless steel 200 cell high flow race cat CNC SS304 stainless steel flanges Smooth radius bends to decrease turbulence and increase flow Lifetime warranty (1 year on catted version) Compatibility2012 - 2018 F30 BMW 335i & 335xi N552013 - 2018 F32/F33/F36 BMW 435i & 435xi N552012 - 2018 F20/F21 BMW M135i & M135xi N552013 - 2018 F22/F23 BMW M235i & M235xi N552015 - 2019 F87 BMW M2 N55ModsDirect recommends professional installation. Contact us with any fitment questions.