CNC machined all-aluminum ADD W1 blow off valve designed. When engines run high boost pressure it's possible that the turbo compressor wheel may shatter under the pressure. The solution is to install a blow-off valve, which relieves excess compressed air in the intake system & intercooler when the throttle is released. It prevents mechanical damage to the intercooler & turbo pipework, prolongs turbocharger life & prevents excessive turbo lag that would be caused by the compressor shaft stalling