I JUST went through this on another car forum. And while 1800 is a crazy number and people shouldn't take the 900 hp per side number too seriously, for SURE we know that 2.5" pipe per 3 cylinders is good for a total of 700-800hp at the crank if not a bit more. At that point going to 3" is at least justified. Anything less and it is a trade off for spoolup.
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