For anyone interested here's the printout from my emissions test yesterday. It looks OK to me - the closest I got to failing was NO2, and that was only 33% of the max value. I've got the original y-pipe and cat and took the max out for a good 20 mins before I showed up. It'll be interesting in two years when I have the budget Y on there.

Incidentally, I checked the CEL and cleared a KS code before taking it in. Judging by what I read on here, I would've failed if I had that code still logged in the ECU. Anyone failed for an 0304?

 

Why would you fail for a KS code? From the thread it seems they just put your car on the rollers and that's it. If you just cleared the code here in illinois you'd have failed as the ECU would not be ready. Here they just plug in the OBDII connector and that's it.

 

Those number are a lot lower than mine, but I have an aftermarket y-pipe.