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Cats are fine to leave on the car unless you just like loud and stinky. Mine runs E85 most of the time through the stock exhaust including cats and runs 9.70s at over 140MPH in the 1/4.
Loud and stinky - 馃. Sucked n pasty turns me on too. What can I say? I鈥檓 a sick bastard ha. What size are the collectors on our stock headers?
 

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Discussion Starter · #24 ·
@jwalker793 I am looking into doing e85 with some kooks green catted headers you guys think I could pass the AZ obd2 emissions with that setup and a good tune? Or would I have to swap back on the stock stuff for the emissions test?
If your car is low enough to the ground, no way atec they are getting a mirror under for inspection. All they do in phx is hook it up to the obd2 port and run a test.
 
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