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Forums › Request a how-to › Post a reply › Re: de-cat.
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[quote="Lewis1304"]I have a decat and very happy with it. "there's a lot of guff mumbled about backpressure, but what happens in a properly designed system is that the exhaust gas velocity is kept high enough to effectively 'pull' the last of the exhaust out of the cylinders and allow more clean air and fuel in for the next cycle. If the pipe is too small, the exhaust gas won't be able to get out fast enough - think blowing through a straw - and the charge in the cylinder won't be cleared as well as it might. If the pipe is too large, the exhaust gas will be travelling too slowly to create the 'pull'. Trick is finding the balance between too large and too small. A catalytic converter will add resistance to flow, so a high flow sports cat or a decat with a correctly sized pipe can add a noticeable amount of power."[/quote]
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