Tired of the dreaded P2261 code. This happens because aftermarket turbo is floor more air, and the small factory valve cannot open up enough to vent the pressure. This upgrade will stop the dreaded P2261 code used on turbo’s such as the Rv6 R660 and MDR 660 turbos. this is especially IMPORTANT when you pour the cylinder head because the cylinder head flow so much more and drives the turbo so much harder. Also, the OEM bypass valve often tears with upgraded turbos and leaves you wondering, where could you possibly have an issue. this upgrade, will solve the problem and have a better durability. This is a venture atmosphere version and is perfectly safe on the K20C engine engines as long as you are still using the original bypass solenoid on your manifold.