12MM crowsfoot socket extension or wrench is the easiest way to get in there (you can usually get one at Sears for a couple bucks); re-torque to 14 ft. lbs. and use new exhaust crush gaskets. Re-torque after the first 100 miles or so after pipe removal/re-install.
If you're putting new pipes on, make sure that you wipe them down clean before you start the bike for the first time. Any fingerprints or grease smudges can bake right into the chrome the first time they're heated up. I waxed/polished mine before I installed as well, just because it was easier with them off the bike.