I like you am considering a thunderbird. Today I went to take a second look and get some out the door prices and vin for insurance quotes. While I was there I looked at the exhaust on a storm and a 1600 parked side by side and couldnt tell any difference in the exhaust/cat.
Based on looks alone the short tors are best in my book! I havent even heard what the bike sounds like with the other pipes on it. My test ride was on a storm with the short tors and it was a pleasing growl that wasnt too loud at all.