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Originally Posted by 87supraturbo
Hey I'm thinking about getting the horsepowerfreaks Goliath exhaust for my supra, and in the video on there site of the exhaust ( http://www.horsepowerfreaks.com/pric...xhaust_Systems ) it says that its the 4" Goliath system withe a 3" downpipe and test pipe, how does that work with the Goliath being bigger than the downpipe and the test pipe?
Thanks
Matt |
You can see gains on a stock downpipe and cat when you install a larger than stock cat-back. Any reduction in backpressure is a good thing, plus from a thermodynamic standpoint exhaust that is close coming out of the turbo is moving very quickly. As it travels farther from the turbo it slows down some and as a result likes to take up more space. Having an exhaust that tapers larger is actually a good thing and is the reason you often see "trumpets" on many race car exhausts (especially if they are open header)