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306 hdi exhaust .. done :)
#2
the sound only really changes with the number or size of boxes so for best power you want de-cat -> de-mid box -> straight through back box

This is because you want to keep the exhaust gas flow as smooth and fast as possible for as long as possible so you want to keep it in smooth pipe of all the same diameter (actually the diameter needs to shrink slightly and gradually along its length to account for the cooling of the gas to maintain the constant velocity but thats far too technical for here)
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306 hdi exhaust .. done :) - by joelww - 21-10-2013, 02:48 PM
RE: exhaust help wanted ... whats the best system - by Dum-Dum - 21-10-2013, 02:59 PM

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