Quick question about a catalytic converter...
With gs headers and gs exhuast piping. It won't fit correctly. If i remember correctly, the gsr cat had a o2 sensor bung on it, and the non gsr.itr cats have them on the headers. So either you would throw a code or the sensor wont reach to where you need. Also. The gsr/itr cats have more of the honey comb inside it possibly making more back pressure than you originally want.
also... the gsr/itr cats are longer by like 3 inches (i think.. maybe 2) and the 2 bolts that go to the headers might be on a different angle. :D i think thats about it.
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