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I have one other realted post but...
I dont think the cat is the same as the resonator but i'm not sure, but dont worry about that in this post
ANYWAYS I have a thermal R&D catback(wanting to trade for a Tanabe Super Racing) but how would it sound if i went to an exhaust guy and had him just give me a straight through pipe? I also have a CAI and DC header. I was going to buy the HP racing but i figured having the DC and just doing this would give me about the same gains.
The guy i go to did this for me on my camaro and it sounds bad as hell now but what would you think about this on an 02 Vic?
Would i get pretty much the same gains/sound if he just "reamed out" the cat?
Thanks

 
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Well, for one the cat and resonator is not the same....the resonator is like a pre-muffler and helps to deaden the sound. If you hollow out the cat or throw a pipe in there....for one, you will have a check engine like on and two, you will loose a bunch of low end and your car, imo will sound like garbage. I my 80 Camaro V6, taking off the cat and adding a dual exhaust made it sound a lot nicer bu on our cars it will not.

 
Rep Power: 412

Bobbyd is right. The resonator just muffles sound like the Air Intake resonator. You take it off it will be louder. You take the cat off on most 4 cyl cars it will sound like crapy. You can get a high flow cat which is made to be a straight pipe but helps the sound. YOur check engine light will be on unless you can bypass the O2 sensor (which has been done so do a search). You will not pass emissions if you have them in your state. And like bobbyD said you will lose backpressure meaning you will lose torque