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I have an 05 cooper s. (My second R53 now) Alta overdrive pulley that i can see. Alta air intake and bigger intercooler. Msd ignition. Ngk 1 step colder plugs. Upgraded intercooler boots and fresh map sensors installed. The previous owner told me it has an alta 17% pulley installed which i sort of believe but my boost gauge only shows 10 psi at wot 6000rpms. My bypass valve is easy to push in but does spring back. So i will be changing that. Im getting a tune but want to make sure that i give the tuner the right info by saying its a 17% pulley. If anyone can help me identify the pulley that would be awesome.
