Supertech Keeper 6mm Triple Groove Audi/BMW/Opel

Headquartered in San Jose, California, Supertech Performance has spent more than three decades engineering valvetrain components for the high-revving performance market, fusing Silicon Valley manufacturing precision with motorsport-driven research. The catalogue centres on stainless and Inconel engine valves, Chrome Silicon Vanadium dual valve springs, CNC-machined titanium retainers, valve guides, valve seats and forged pistons, with springs computer-modelled for harmonic balance at extreme RPM. Supertech components ship in complete valve spring kits and individual upgrade parts for Honda K-series, Acura K24, Toyota 2JZ and 4AGE, Nissan SR20, BMW S54 and S55, Subaru EJ25 and Mini N14 engines in time-attack, drag and circuit applications.