AMS Performance UK, BMW F chassis N55 catless downpipes now available!! AMS Performance N55 downpipes, 4” version for the F chassis N55 cars for the BMW production date after 07/13. The AMS Performance catless downpipes replace the stock cats to eliminate back pressure and allow your turbos to reach higher boost targets and spool faster. Use the AMS Performance catless downpipes with the AMS Performance stage 2 F chassis and expect up to 25 wheel horsepower gains. In addition to the performance gains, the N55 catless downpipes will add a nice exhaust tone to your M235, 335 or 435 BMW. The N55 downpipes are offered with a lifetime warranty against defects and fitment. Extreme Power House offers customer satisfaction guarantee on all AMS Performance products, if you do not like it you can return it no questions asked.
Smooth transition from flange to pipe
Up to 25 wheel horsepower gains