Ive got all the mods in my sig and havent noticed a change in fuel mileage. I know I am nowhere near 300rwhp, but just to give you an idea.
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89 notch-finally not stock!! ported gt40's, ported cobra intake, 65mm tb, 75mm maf, mac cai, lt's,prochamber, fms 1.6 rr, 125 shot.
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