How much does piping diameter affect HP?
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iTrader: (4)
Stock DP? Does that mean that JDM 13b-rew's come without the pre-cat.? In any case, I have a HKS DP that I'm pretty sure is "only" 2.5 but since it increases both Hp and longevity, I wouldn't divert funds to replace an upgrade instead of getting another. I read your mods and considering you have the intake, exhaust and boost controller on hand, it's a tossup between taking advantage of a safe 12-13 psi of boost with a fuel computer, or an upgraded intercooler that will give you an extra margin of safety (and HP) until you get a fuel computer to run elevated boost levels I'm at no means an expert but going by my limited experience of slapping upgrades on my FD. Hopefully others will chime in...
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