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Originally Posted by EuroKar
I just installed the GT Haus full exhaust system including catless downpipes. With just the exhaust system this M6 put down 549HP and 499FTLB to the wheels on a Mustang Dynameter.
The charcoal filters are removed now and I have a custom engine tune being made by OE Tuning which is based out of Southern California.
I will post up information on performance gains and lots of pictures in a new post within the next 2-3 weeks once its all finished and running great.
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While I agree full ECU control is best , I'm starting to think no one will crack this ECU . OE tuning has been selling the same modified development file as everyone else . If you want proof ask them to remove the speed limiter and prevent a CEL from running catless and see what they say .