"torque virtually disappears" , Autobahn 69 u must be on crack, most guys run short runners who run turbos, it alleviates custom tubing issues, you will gain high end power, from what i know your torque curv just rises in the rpm band a little, if its normally aspirated i wouldnt bother http://****************.com/smile/emthup.gif
runners should be tuned to n/a powerband, with boost its a whole new game where max flow is all that counts..
my old taurus had this massive intake that would change geometry at 4000rpm , sounded badass when it engaged. i think alot of newer cars are going to continuosly variable geometry intake to maximize velocity at all rpm ranges so you dont get stuck with mediocre power band.
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