Quote:
Originally Posted by onfireX5
BIG THANKS to Miko M for sending me his catalytic converter ! Test would not happen without him.
Factory secondary cat flows 542cfm at 28" H20
For reference, an open 2.50" pipe flows 515cfm.
An open 3" pipe maxes my bench at 702cfm.
Also put a 2017 ZO6 cat on to test...
482cfm
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to you and Miko M for coordinating to make this test happen. The world needs more real data like this.
Reading between the lines the F90 secondary cats don't seem to be a real factor when it comes to making more power but as with any turbo car removing some flow restriction behind the turbo should help spool / response.