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Inner diameter of stock downpipes?
#3
The black widow pipes probably have a bigger internal diameter but the stock pipes will match the exhaust port better and the sudden step increase in diameter will cause turbulence inside the pipe slowing the flow. 
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Inner diameter of stock downpipes? - by Freza - 22-06-17, 02:23 PM
Re: Inner diameter of stock downpipes? - by Jules-C - 22-06-17, 03:14 PM

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