BMW N54 Spool Performance Helix HPFP Overdrive Unit adminMarch 18, 2024spoolhelix, hpfp, overdrive, performance, spool, unit BMW N54 Spool Performance Helix HPFP Overdrive Unit. Comes with billet cover for vacuum pump. Helix overdrive kit complete. Incoming search terms:Buy Helix HPFP Overdrive Unit Online at Spool Performance Shop