S&S
I hear what you are saying; looking at the drawings of the DLE55, I cannot imagine that they would design the muffler on the RA to extend further aft than the engine mount standoffs. It would be nice if DLE or Tower had a DLE55RA manual for download, so that those dimensions could be checked.

For my application, so long as the muffler is not aft of the aft end of the standoffs, I think I will be OK with the RA.