Bought the 3" Summit exhaust system

Has anybody used the 3" summit exhaust with the McCandless/Pro Parts headers?
I just bought the system. Haven't even taken it out of the box yet, and it will be a few weeks before I get around to installing it. The system is made for Hooker headers, and I'm running the Pro Parts headers, so there will be a bunch of tweaking I do believe. I'm also going to relocate the 1/2" fuel line and filter, as it runs right where the right side tail pipe needs to go.
Right now the car has 2 1/2 " exhaust that ends before the rear, with Warlock mufflers. The inside of the car is real loud, and the wife gets sick from the smell. I figure this should take care of the smell with the exhaust dumping out the back of the car. Not sure how quiet it will be though. Will the interior be noisy with this setup?