Spool - Helix HPFP Overdrive Unit – BMW 135i / 335i E8x / E9x N54 / N55 Including Helix 10 micron filter unit (recommended)*:No required• power gain through improved

required• power gain through improved exhaust gas flow

Full-coverage shot peening treatment

Designed for a perfect fit and optimum performance

supports up to 1000 hp on tuned engines

Spool - Helix HPFP Overdrive Unit – BMW 135i / 335i E8x / E9x N54 / N55 Including Helix 10 micron filter unit (recommended)*:No required• power gain through improvedThe Spool performance Helix HPFP Overdrive Unit has been developed for BMW N54 and early N55 engines to significantly increase the capacity of the original high pressure fuel pump (HPFP). By increasing the HPFPs rotational speed, the volume of fuel delivered is increased, thereby preventing pressure drops at higher power outputs. This provides an effective solution for high power builds without the complexity of additional port injection systems.