Quote:
Originally Posted by semtex
In all this discussion about CELs and extended tubes, etc., I think we've glossed over something else that's kinda significant. Stillen claims less of a gain on their HFCs than Berk. Although I must say, their web page for the HFCs is a tad confusing right now, because they claim only +9hp and +8ft/lbs tq. Yet, when you open up their dyno chart (for a G37), it shows +16hp and +13ft/lbs tq. In any case, they're claiming less gain than Berk either way you look at it.
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It is possible they are using a less flowing cats on theirs compared to Berk, so they may clean better but also flow slightly better. Berks are proven and flow great. If someone get's these cats, please take a picture inside of the cat so we can see how they are made through one of the pipe openings.