Throttle body is a waste of money as long as you have the stock heads, so is replacing the maf. Next up is probably gears and a shift kit and a tune honestly. After the headers and mid pipe anyway. Lontubes are best. X vs H is all personal preference.
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2000 Mustang GT Steeda build #48. Bolt ons, suspension, Novi 2000.
Just because I give you advice, doesn't mean I know more than you. Its just means I've done more stupid ****.