Yesterday I had a good look underneath my car when it was up on the hoist and I could not believe the size of the resonator at the back half of the car just before the rear tires. Does the Sedan need that big of a resonator? if I take it out and replace it with a straight pipe will it sound more like a coupe or would it be too loud? and finally if I go with high flow cats would that make it too loud as well?

 

Hey G man....
You can buy a used mid pipe from a coupe and it's a direct DIY bolt in..

There's lots of info on this.