Actually, in my book of dyno runs, it shows long tube headers make more power throughout the whole power band from idle to redline. So their is no trade off in putting in the long tubes vs. shorty's.
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1993 Mustang GT - March Ram Air & Pullies, K&N, C&L 73mm MAF, 3.73 Gears, Super Competition Hooker Headers, 2 1/2 in. High Flow H-Pipe & Cat Back, Pro 5.0 Shifter, 16* Timing Advance, 8.5mm MSD Super Cunductor Plug Wires, Romoved front Sway Bar, Pro-Shift Lite, LX lights
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