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Originally Posted by 90RS13
You just said exhaust, header, and tuning....you never metioned he was using 104 octane fuel. You can tune timing alot more aggressively with 104.
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104octane will shift the timing a bit, but by the smallest margin (probably a couple donkey's). I don't think it is the performance enhancer that you think it is to be. The purpose of higher octane fuels is to prevent knock and ping, (actually lowering the knock signal a bit). Shure it freed up a little room as far as timing, but then again that is mostly the ecu tune, and when I mean by the smallest margin probably like 5HP at the most was gained using that fuel.