Same size header you just describe 1&3/4"in primaries 3"collectors just looked at my paper work lol. Car made 407 hp and 379 ft-lbs at 6480 RPM (that was the peak)
Made that at 9.8:1 comp ratio. Wonder how much it would wake up with 243's and how much the curves on the dyno sheet would change? Maybe make peak power lower? The car dosent really come on until about 4500rpm but it pulls like a freight train if it hooks
