hey bro, not sure which company is better, but defintely get Equal length headers, 3.73 is fine for your 4.6, 4:10's will over rev your engine and are more for the cobra 32v engine. 3:73's are fine,so get the headers, gears, a vlv job, and then get a custom chip for your setup. That should bring down your time a little.laterz
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