Rvng 4.5” B58 Race Downpipe With the Rvng 4.5" downpipes back pressure is significantly reduced by eliminating the restrictive catalytic converter in the factory downpipe which results in faster spool, an increase in power & a more aggressive exhaust note. Our downpipe features a full 4.5″ stainless steel design as well as a CNC 304 grade stainless steel flange that offers a smooth transition from the turbo to the mid pipes. All Rvng downpipes are hand crafted from SS304 grade stainless steel and include a lifetime warranty as well as our “No Hassle” satisfaction guarantee (includes fitment) Made from hand crafted, tig welded SS304 grade stainless steel. Cnc tube bended for a Smooth radius bends to decrease turbulence and increase flow as well as a perfect fit guaranteed CNC SS304 Stainless Steel Flanges. Gains anywhere from 15whp-20whp without tune and up to 25-30whp with tune. RVNG Lifetime Warranty This item fits the following BMWs: All Gen 1 & 2 B58's (Including Toyota Supra)
