They may seem tight, but it's probably a shield around the pipe. Mine did the same thing and it seemed fine until I actually started removing the shields. That's when I found a broken shield mounting tab and some clearance issues. Those shields are pathetic and they mount metal to metal on the exhaust, so it's actually surprising to me that they don't make more noise than they do.
You could also have a rock stuck between the pipe and the shield.
I removed all of that wrap around shielding.