Smaller diameter proven time and time again. Go with the 2.507TitanLE said:Well, I've read all one million threads about exhaust upgrades on TT and I've narrowed it down to two. I am torn between the Volant and the Gibson. My biggest dilema is that I am unsure which one I want because I've heard alot about the different diameter tubing and the effects it has on low-end torque. Volant is a 3" and Gibson is a 2.5". With that said, which exhaust would be good for someone who needs that low-end torque because he tows and hauls alot? Are these two my best options? P.S.- I don't want an abnoxiously loud system because I do a lot of road trips and 6 hours of drone is not something I want.