I watched my buddy get his LS1 dyno tuned last friday at Carolina Auto Masters. He went from 3.27's to 4.10's. We asked Creech about it and he said that you should lose anymore than 5hp, but you'll pick up a little torque. Creech is well known in the south for his work with LS1's. I don't see why it would be any different on our Mach's.
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