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Message: <blockquote data-quote="savahn" data-source="post: 3675845" data-attributes="member: 49185">kk13,3 inch straight pipes are not road legal in most parts of the world due to noise and emissions. And they are not neighbour friendly - they could hear you a mile away.Turbo-charged race engines use straight pipes - the lack of back-pressure means that the exhaust can flow freely right through the turbo improving available power at the upper end of the rev range. I am told that low-end torque supposedly suffers but this being a turbo engine, I can't really imagine why.This is not the same for most NA engines.Edit: please note that large straight pipes do not increase power. The power output of your engine is still the same. It merely makes more power available as less energy is required to overcome back-pressure - you free up maybe 5HP at most :)</blockquote>

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