CTS Turbo 4.5″ Race Downpipe for BMW B58 1/2/3/4/5/7 Series RWD & XDRIVE – All Generations

This CTS Turbo race downpipe delivers a substantial 4.5-inch diameter bore designed specifically for BMW's B58 turbocharged inline-six. Compatible across 1, 2, 3, 4, 5 and 7 Series platforms in both rear-wheel and all-wheel drive configurations, covering all B58 generations. The oversized construction dramatically reduces exhaust restriction compared to factory components, improving turbine efficiency and throttle response. Built for serious performance applications where maximum flow is essential. Suits vehicles with modified engine management and complements aggressive tuning strategies across the entire B58 platform range.