I bought a practically new set of Rhinehart slip-ons a couple of months ago for $200, thought it was a good deal. The prob is the mufflers have a 2" id inlet and the exhaust on my 06 classic are stock 1 3/4". I'm thinking the Rhineharts are true dual slipons. I can buy or have built adapters to adapt down but after reading several post on slipons and back pressure for the rear cylinder it makes me wonder if this would be ok. I have a tuner on my bike but would it be possible to tune for this setup and would it be ok on the engine?