Adjustable FPR (Fuel Pressure Regulator) for stock EVO 6/7/8/9. Replaces stock FPR and bolts directly to stock fuel rail. Allows adjustments up to 5 bar (75 psi) base fuel pressure. Useful for fine tuning or increase fuel injector capacity to support additional power without changing out to marginally larger set of injectors. Contains all hardware to drop right in and dial in your fuel pressure!