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I've got an FVD performance chip in my 928. I haven't had it dyno'ed with the chip, but I can easily tell the difference. On the same on-ramp to the highway, before the chip I'd hit about 70 before making it onto the highway. Now I'm north of 80mph and have to slow down once I get on!
Aside from improving the fuel management, my rev limit was raisd from 6000 rpm to 6200 rpm. I'm still not sure if that makes any difference since I believe max horsepower for each gear occurs in the mid-5000 range. The extra rpm limit may increase top end, but I'm not about to try to top 160mph any time soon.
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