has anyone every done a true dual exhuast if so does it sound good and giveany noticeable performance gains.i've only seen it on one camaro.

 

It's beendone. The ones I've heard sound good. I don't think the gains aremuch(if any) better than your basic aftermarket catback. Try the search feature a couple have wrote about this. In fact someone just did his and posted about it.

 

There is no real reason to do it untill you are making some big time power. A single y pipe (like stock, but 3 inch) will support over 500 rwhp.

 

You can do it, but it's an expensive and complicated procedure if you want tips out the back still. It's pretty easy if you dump the exhaust before the rear axel, but as JD said, you're not going to get much until you're making some serious power.

 

thanks. also do cat back systems come with the y pipe to. i can never tell.

 

No, that's why they are "cat back" because they come after the Y and cats.