Yes fuel pressure and timing is critical for optimum HP. The dyno simply finds the ideal setting for timing and fuel pressure wich can net big gains in HP I have heard of people picking up 20+HP from a dyno tune.
Later,
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92' LX-Big brakes, Lots and lots of suspension, GT40X heads, Ported cobra intake, stock cam, Vortech SC trim.
00' Lightning-Stock
88'CRX-13 second ego killer
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