Quote Originally Posted by greasemunkey View Post
just had a magnaflow cat and resonator put on today, thought it might pass emissions, of course it didn't.
25/25 test
-hc - reading 00272 allowed 00160
-no - reading 03162 allowed 01179

50-15 test
-hc - reading 00260 allowed 00166
-no - reading 03327 allowed 01304

car doesn't have an egr system anymore, even the iacv has been ruled out. not sure what all was done previously, just was told the ecu was chipped by scotty. any suggestions on how to pass? I was reading to run high octane and retard the timing. no cel's brand new cat. drivetrain is a b18c1 and higher comp. pistons yeilding roughly 11.45:1 comp ratio, I also read higher compression creates higher nox levels. any helpful info would be greatly appreciated.
did i just chip it, or did i also dynotune it? o2 sensor enabled/working? try running the car for a while on the highway to really heat up the cat. mark the dist and retard it all the way. go pass. of course if i just chipped it w/ a basemap then it needs to be tuned first otherwise you'll probably be wasting your time.