stock aveo exhaust size??

[AveoTuner2004]

Hello just wondering what the stock exhaust size is??

Also I am in PA and was wondering if I would pass emissions if I put a magnaflow precat off the header and then put a round body magnaflow converter under the car?

I am planning on getting a steel tube short header made for my car with a flange so I could bolt a precat off the header.

[chefgold]

I think its 1 7/8....not sure, you shouldnt have any problems with emissions with the set up you are talking about, there is more room then most think for a header system..the set up stock runs through the cat to a resonator so you could easily adapt a 4/2/1 into a cat....good luck with it