The name says it all SLIP ONS. I would suggest you get new clamps, mine had a very very small leak at the joint, new clamps fixed it right up.

 

I have re-used my stock clamps at least a dozen times so far. i cannot imagine any product available on the market being any better than them. If you feel it's absolutely necessary, procure another set from an H-D shop and use some anti-seize on the threads, torquing them to, what?, about 50 lb-ft.

 

I'm looking for slip ons for my '09 SG. A friend has Rush slip ons dealer installed on an '08 Ultra. No remap and it runs and sounds great. No warranty problems. They told him that the computer will correct itself in a half hour or so of running time. It seems that it did just that. I'm going the same route.