StopLight.
Yeah, the H-pipe made a Noticable diffrence in performance, dont have track times to back anything up, but I have an extremely sensitive Butt.
Something else that made a noticable diffrence is the Resistor in the Air temp trick.
Dont have that on my sig. Give it a try you'll be impressed. Poor mans way to advance timing on a 4.6.
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64 1/2 "D" code Red Mustang Coupe. 289, C4, Mallory duel point. Ported & Polished 65 heads shaved .01 with 351 valves, 11:1 comp, 1.7:1 rockers, blue wolverine lumpy cam, modified 4100 Hipo 4 barrel. GT Apperance pkg. And to many others to list
2000 Perf Red Mustang GT. 5spd. BBK Underdrive pulleys, Flotech off-road H pipe. Hurst T-Handle, 40 series Flowmasters, Steeda Tri-Ax. Ordered 4:10's.
64 1/2 red 6cyl coupe. Future resto.