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The stock exhaust pipe on the 2003 GT from the Y clamp is only 1 7/8" big,or should i say small.If your looking to get a better,deeper sound with a little more power try the following,but don't do it,unless you want to go thru the trouble.I took a High Flow cat back,and removed the resonator,took the stock mufflers off,and placed 2" exhaust to the y clamp. Then placed a 2 1/2" exhaust pipe to the back of the muffler where i placed 2 gold tempered apc ch-067 large barrel tips on the end.(or try borla tips,they run about $35bucks) I will try and post a sound file of my exhaust,i love it,plus i did get some more horses at the wheels,this is after testing with performance mufflers,and cat,with resonator still installed. **Please dont try this if you live in a nieghbor hood of all old people.

Faults-
You may not pass emissions test when that wonderful inspection time comes because of the resonator being removed.

pictures of this would be cool too. I am getting Greddy EVO2. So should I remove the resonator and get a high flow cat even with a catback?...kind of curious to see what you described.

I found that removing the resonator just gave this car a beautiful sound.I know its a so called ricer to most people,but the sound it gave is not a ricer sound,someone told me one time that it sounded like a old muscle car coming down the street. I will post a pic soon once i get my da** camera working,cant figure it out lol.but i highly recommend getting that cat off,just remember emissions test.

cool thanks