ARM Motorsports Catless Downpipes 4.4L V8 Twin-Turbo 304

The ARM Motorsports N63RDP catless downpipes are engineered for the 4.4L V8 Twin-Turbo N63R engine, specifically targeting enhanced performance and sound for vehicles like the BMW M550i. Constructed from full 304 stainless steel with a 3" diameter, these downpipes replace restrictive OEM catalytic converters to reduce exhaust back-pressure. This allows turbochargers to spool faster, potentially increasing power and torque across the entire RPM range. The design prioritizes smoother airflow and aims to produce a more aggressive exhaust note even with a stock exhaust system. They feature a mesh flex section to relieve stress between the upper and lower sections and include upper and lower brackets that secure to the engine block and transmission housing, respectively, using the same mounting points as the OEM parts. Two O2 sensor bungs are included on each downpipe to maintain factory sensor locations for proper DME monitoring and smooth engine operation. The product includes the ARM N63R 3" Catless Downpipes, ARM Crush Brackets, and a hardware kit. Fitment includes various BMW G-Series models equipped with the N63R, N63M, or N63B 4.4L V8 Twin-Turbo engines, such as the G30 M550i, G05 X5 xDrive50i/M50i, G11/G12 750i, and G14/G15/G16/G06/G07 M850i/X6 M50i/X7 M50i. The product comes with a lifetime warranty against defects in craftsmanship or fitment.