B58 4.5" 304 Stainless Steel High Flow Catted Downpipe

The VRSF High Flow Catted Downpipe is engineered to enhance the performance of your BMW B58 engine by significantly reducing back pressure. This is achieved by replacing the restrictive factory catalytic converter with a high-flow 200-cell unit, resulting in faster turbo spool, increased horsepower, and a more aggressive exhaust note. Constructed from hand-crafted, tig-welded 4.5" 304-grade stainless steel, this downpipe ensures durability and optimal exhaust flow with its smooth radius bends. The CNC-machined 304-grade stainless steel flange provides a seamless transition from the turbocharger to the mid-pipes. Installation of this downpipe is expected to yield gains of 25-30 horsepower when paired with a tune. VRSF offers a lifetime warranty on their race versions and a one-year warranty specifically for the high-flow catted downpipe. This downpipe is compatible with a range of BMW models including the M240i, 340i, 440i, 540i, 640i, and 740i, across various model years from 2016 to 2024, including xDrive variants.