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it should be the other way around.Hotter gasses are on the downpipe and need more space.After they go away,they get colder and more dence and the wider diameter is not that much needed
Today after a talk with the exhaust people in AAS here in Newcastle they told me that even in race cars they build they tend not to go to very wide exhaust pipes as there is no need. I was told that my 70mm catback is enough for 500+hp and the 76mm downpipe as well.
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