You have stock heads and your thinking of going past 6000rpms? Im sorry to sound harsh, but your completely lost. The intake you have is fine. And try shifting at 5400 or less.
Skyler
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-1989 Saleen Mustang #406- TFS Heads, E-303, edelbrock intake,70MM TB, 73mm MAF, off road H, headers and 3chamber flows.
12.55@107mph
50-175 Nitrous Works WET Kit just added.