CSF BMW M135i/M235i/M2 N55 Race High Performance Intercooler (F20/F22/F87)Have an ECU Tune? You'll need one of these. Once the boost is raised beyond the factory levels the stock intercooler struggles to cool the more compressed, thus heated air leading to high charge temps and the ECU reducing power. The CSF Race High Performance Intercooler dramatically reduces charge temps versus the stock intercooler, especially on cars running higher boost than stock. PRODUCT SPECIFICATION A power increase of 15 20 hp on stock cars,