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Here's a CLK500 with a turbo and the guy says in some of the comments that he didn't have trouble with tuning. Maybe the NA ECU is better suited to aftermarket turbo kits and what not.
No, I ment the ECU, not the actual engine. I ment using the NA ECU with the 55k because maybe there's less tuning issues, no parameters for SC clutch and no 17 psi limit and what not.