www.fullsac.com is the only place I know you can buy them. I got them and like them. Talk to them about what size baffle you need for your build, they make different sized baffles.
If you guys were trying to contact Fullsac during the Thanksgiving holiday, the owner was out of town and then required a few days recovery after getting his marbles rattled in a rollover accident in an off road race car. He's back to work now, try him again.
RB
Steve at Fullsac will either recore yours, or sell you used recored slip-on mufflers, your choice. I have some that I bid on Ebay and love them. Great sound (not real loud) and better performance. Good luck. Hope he is OK.
These are some pretty nice sounding pipes. Not real loud (louder but not ear splitting), throaty, and a bit more power. Lets the engine exhale alot better. I'd recommend 'em.