Quote:
Originally Posted by Miko M
@onfireX5
Did you measure the cats I.D.? Is it 2.5"?
Very impressed with primary and secondary cars!
Didn't expect that stock air filter is only off from straight pipe 15%
And 10.5% from BMC filter.
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Roughly 3”. The substrate is what drops the flow down from a 3.0 to a 2.5