What are your EGTs? That turbo is kinda small for that engine. You need something at least 60mm's with a .63 turbine housing(t3) or, preferably, a .68(T4) housing.

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1997 Mercedes E320 Turbo
Garrett T3/60-1 Turbocharger
Custom Water Intercooler Setup
352rwhp/366rwtq @ 8.6psi in '08

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