Quote:
Originally Posted by Caravanshaka
you aren't separated by 8-10 HP once you factor in the high flow cat with the cat-back combo (which most people doing an exhaust will do both)...in fact Berk Dyno'd a gain of 32hp (19 from HFC's first, then another 13 adding exhaust) with their combo...
Like I said though, add a turbo and you may feel a difference from the straight shot compared to a couple extra bends. with both having Mandrel bent piping the gains aren't going to be significant even with a turbo. Maybe an extra 3-4 hp overall running 7 - 10 psi.
Forced induction will go well with any of the exhaust combo's out there, but if you are serious about boost you are going to want to increase the piping diameter, and you will likely follow the FI routing for a straighter shot. but that is going custom anyway.
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I would like a link showing those gains that BERK received because I was following that and they got something like 13whp from the exhaust but I don't recall them using HFC with it..this exhaust got 20whp without HFC. Also on the BERK video of "prototype #2, which is apparently the same as #3, there is an AWFUL rasp as the exhaust winds down after a rev. People are saying that this rasp is normal when using flex pipes, which is why F.I.'s exhaust doesn't have that annoying rasp. I friend I know said that flex pipes are necessary when you have welds on that first section of piping after the cat(which BERK has) because the welds will crack due to engine tourqe. FI's exhaust appears to be one solid piece of bent piping which will hold up fine. I know this has been discussed but I'm curious if that last part is true !?