Quote:
Originally Posted by ls1 Ac Cobra
They don't divert from one pipe to another have seen them on a hot rod when opened exhaust still flows out back but open out the side just for noise before mufflers.
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It all depends on the car/exhaust setup. If you're dumping before cats/mufflers (restrictive mufflers) then there's going to be quite a bit more flow out of the dumps than there is out the mufflers. Fluid flow will always prefer the path of least resistance. Granted there will still be some residual out the rear when the fluid friction out the dumps gets significant enough to push it out the back,
That's why I said for a typical cobra setup, I don't think it would accomplish much at all, sound or flow, cause most cobras are pretty loud to begin with (with straight through muffler design, if at all) and the flow isn't affected all that much because A) most guys aren't running cats, resonators or other restrictive components B) most cobras have shorter exhaust setups and C) lots of cobras don't run mufflers at all, and if they do they're very unrestrictive (aka loud).
Keep in mind that for a particular engine setup, there's an optimal exhaust design. Most guys think bigger is better and with respect to exhaust, it isn't always true. In most cases, you lose low end torque and in some cases, you even lose high end flow, because there's no scavenging effect with a virtually unrestrictive setup. (we could discuss scavenging in another thread altogether).
Bottom line, like I said, it's more of a trick than a performance mod. It should be one of the last things you do if you have a performance mod list. It's about like lighting the exhaust out the tips (flames)....doesn't really do anything to help the car go, stop or turn, but adds a "trick" factor to your ride.