This aggressive race-only exhaust for the BMW 335 includes both mid and center pipes (bolt-on from the downpipes back) which eliminate the secondary catalytic converters. This eliminates a HUGE amount of exhaust restriction, opening the door for huge power gains, particularly on cars with increased boost. Every Borla exhaust is made in the USA using the highest grade T-304 stainless steel. Includes mid pipes, center pipes, and rear muffler sections, as well as the correct size clamps for a completely bolt-on installation. Best of all, Borla stands behind every system with a Million-Mile Warranty.