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I have a chinese 2871 clone that was creeping bad, I ported the housing to match the manifold as well as the flapper (not the flapper opening, but the flow path to it). My 12 psi wastegate is preloaded, I run a boost controller off the ecu, and my boost is rock solid up to 20 psi (pings after that).
I doubt a genuine Garrett turbine housing casting is as bad as mine was, so +1 on porting.
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