Originally Posted by Dan@FastFord
what power are you expecting from the engine chip?
iirc a 38mm w/g is good for 600bhp
much more and you need a 42mm one
bhp and wastegate sizes are unrelated. can run 2million bhp with a stock internal gate if wanted.
basically the bigger the turbo and the lower the boost you wanna run, the bigger the gate needed so less gas goes thru the turbo.