Stock 99+ heads flow pretty darn good, I think the intake manifold and throttle body are the main culprits. Go to gefracing.com, they have BUllit Intakes for 349 dollars with the throttle body, they supposedly flow 50 percent better, but i have yet to see any flow numbers, plus its alunimum.
Long tube headers like from BBK will help top end out, that and a off-road H-Pipe, or hiflow cats should be a little extra kick.
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64 1/2 "D" code Red Mustang Coupe. 289, C4, 3:1 rear gear. Mallory duel point. Ported & Polished 65 heads shaved .01 with 351 windsor valves, 11:1 comp, 1.7:1 sled rockers, blue wolverine lumpy cam, modified autolite 4100 Hipo 4 barrel. GT Apperance pkg. Period white wall tires. And to many others to list
2000 Perf Red Mustang GT. 5spd. BBK Underdrive pulleys, Flotech off-road H pipe. Hurst T-Handle
64 1/2 red 6cyl coupe. Auto. project car. Mods, Rust, rust, and more rust
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