We used a FAST XFI on Parson's II Much Chevy II with a 427 CI, 630HP LS2. Solved all his problems. Have not used Big Stuff, but have not found anything XFI won't do. What it really will boil down to is which system you can find familiar tuners in your area. I think FAST out sells Big Stuff, so there is probably a better chance of finding tuners that know the program. Also, if we supply a FAST, we provide a custom startup program for your engine
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Frank Serafine
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