Here in my local we're not required to have emmissions testing until 2 years have past for new cars. I think that the few '03 and '04 GTs with Stage 1 are only just beginning to be tested.
I'm not sure what kind of load or RPM the cars are tested at. The tests that I have observed seemed to be done in neutral gear at various RPMs.
It doesn't seem to me that Stage 1 will make much of a change at the lower end of the RPM and/or power range where the testing is taking place. Having your engine in good tune should get you through the test.
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