Have you tried to adjust the wastgate spring?

I found a rebuilder online, but they wanted $950. Performance Products has rebuilt units between $660 and $780 depending on year. Wait for the 15% off sale

Craig

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1994 E420, Pearl Black/Black. 2.82 rear diff., AMG front spoiler, painted lower half. SOLD

1972 & 1974 BMW 2002tii's.