Rinehart tru duals are 2 inches, RUSH makes a 2 inch slip on, not sure about V & H. I'm tossing around the idea of switching to the Rush slip-ons because the Rinehart pipes are just getting to me on long rides...must be getting old.

 

i had same issue
i already had rinehart slip ons and i wanted to just buy the true dual headers and rinehart said they will not fit
he stated to me any pipe that fits on stock headers will not fit on there true duals hence forth why they are sold as a complete set
now if V and H has an adapter with the muffler kit to accomadate this then great if not you probally will be getting a call from your dealer stating they will not work, That is why i had to go with V and H true dual headers due to the 1 3/4 outlet.
MAKE SURE you tell V and H that the true duals have a 2 inch opening they may not be aware of that due to the fact they are competitors in the market. I would Call both manufactureres and double check before you invest $600. Just a PYA