On my book of dyno runs, it shows the the equal length making more mid range and most top end but the unequal length making more down low and just a hair more at a really higher rpm (5000+) on a stock motor.
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1993 Mustang GT - March Ram Air & Pullies, K&N, C&L 73mm MAF, Edelbrock 65mm TB & EGR, 3.73 Gears, 1 5/8in. Super Comp Hooker Equal Length Headers, 2 1/2in. High Flow H-Pipe & 2 1/2in. Flowmaster Cat Back, FlowTech Cut-Outs, Pro 5.0 Shifter, 16* Timing Advance, 8.5mm MSD Super Cunductor Plug Wires, Romoved front Sway Bar, Nitto DragRadial, Pro-Shift Lite, LX lights
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