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Old 08-04-2007, 12:54 PM   #3
Dyno Flash
Member#: 73568
Join Date: Oct 2004
Location: Stamford, CT
'05 STI 11.1 @ 127
03 Evo 8 9.5 @ 149


I have never done A - B testing on the stock 07 upipe

The stock unit has no cat - however it is somewhat restrictive and a aftermaket one is going to free up air flow

One day we will have to do a A - B test to quantify any gains

With the stock air box and TGV's in place I am not sure the upipe is contributing all that much - maybe as the customer progresses in his stages the upipe mod will reap more benefits
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