Best bang for your buck, and best sound by far, is WIDE OPEN
I cut mine off at the downpipe, just dumps right under the floor, and it sounds so much better. a little drone around 1200 to 1400 RPM, but at cruising speeds its fine, it quiets out and is no louder than it is with the exhaust hooked up, which surprised me. Dont With the cat gutted and hangin off the DP, it was louder, like a magnifying chamber or somethin.
Asside from open, i have a 3 inch dual system from the cat back with dynomax super turbo mufflers, believe its a torque tech system, best looking exhaust at the exit that ive seen. perfect exit angle and perfect length and cut. Also, its pretty quiet, actually, VERY quiet outside the car, but sounds good. when i go to buick meets, and ran my car, it was the quietest car goin down the dragstrip, cant hear anything. Other TRs/GNs just drown mine in noise, which i like, but some like it quiet. Interior does resonate a slight bit at 1700 RPM with the exhaust hooked up, otherwise its quiet inside too.