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Im having an external wastegate issue as well...Im running a GT28R @ 17psi top mounted with a Tial 38mm wastegate. In 1st the car doesnt want to boost at all really, maybe like 5-6psi and I can also hear the screamer pipe at anything above about 50% throttle and sometimes in 2nd it acts the same way, its like my wastegate is sticking open or something, maybe time for a rebuild w/ new springs?? I also have an exhaust leak in my manifold before the turbo so Im going to get that fixed and see if it solves my problem....
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