Ill put it to you this way, Im running the mods in my sig with the stock fpr, and no problems. The thermactor "bump" is and injection hole for the smog pump to pump air into the exhaust ports into the sorry excuse for exhaust ports in fords heads. It sticks down from the roof of the port, and when ported correctly, can produce significant gains.
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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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