In my 88 gt a chip made about a car length difference. A friend and me raced before and after the chip, we were dead even before and I was about a car in front with it. You could defiantly see it pull harder when we were side by side but it was not anything you could feel. This was on a speed density car so I don't know if that makes any difference.
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James Cox
nochevy@hotmail.com
1991 Mustang LX
No good times with 347 stroker yet!