I originally tried Magnaflow 16573s. Then I took a ride is a 2010 Roush 427R and knew that was the exhaust system for me. At the same time I installed the supercharger I installed the Roush exhaust system for the 2010. This is a catback system of sorts with "glass packs" between the cats and the axle, and Roush logo tips out the rear. The sound is GREAT. The exhaust is labeled off-road, so some states will have issues with it. That aside, it produces a strong sound. At highway cruising speed there is a slight increase in cabin sound, but only slight.
I just install the Pype-bomb on mine. It's pretty loud, but not much drone. Plus it's all polished, eliminates the mufflers (lighter and cleaner look), and I got it for only $198.