They had an article on the Diablo chip last month. If you call an mustang performance shop on any given day I'd bet atleast 9 out of 10 will tell you to go with JMS. He was the first I can remember doing any chip tuning.
Superchip was once a generic chip, just like ADS. Now they custom burn chips... only thing is they are more of a GM chip burner specialist. I talked to the guy who owns Pro-m last year at Bradenton fla(FFW) and he told me Superchip was into gm and I think imports(I think).
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