I beg to differ on the 99 exhaust helping. A bassani X pipe with cats picked my car up at least 20hp even with the stock cat back and manifolds still on. before x pipe 13.99 @ 97.78 after 13.71 @ 100.69. Same track same weather. But then again this was on my car with some other mods having already been done. Maybe the x pipe picked it up more than it would on a totally stock 99 GT.
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