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This is a common problem on larger internally gated t25/t28's. The problem is the larger compressor wheel and turbine wheel with the small back housing and internal wastegate. There is a lack of flow through the wastegate. Some options would be:
-port the wastegate
-run a larger .86 back housing
-go external wastegate
-introduce some restriction on the exhaust
My suggestion is to go external by modding the manifold or getting a "t25 plus" housing
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