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Just wondering to see if a chip is worth is, all i really have is bolt ons, and a lil shot of juice but i got the retard box for that, i got the complete super ram intake, deleted air pump, under drive pulleys, headers, full 2 1/2 inch exhaust, no cats with flowmasters, 58mm tb, all the free mods, if i were to get a chip from pcm forless would it show a big difference, i would like some testimonials if available, its a 91 vette with 3.07 rear end, automatic