Andy, I just went thru some of ur tech articles: was wondering how much the dyno headers w/ the long "straight out" primaries are worth over a set of , say 2" TTI`s ??
Good dyno headers are probably worth 10 or 15 hp over a typical passenger car header but it really depends on a bunch of factors including how much power the engine is making and what is down stream of the headers. All of this stuff works together.