Last October I bought the gs1100e (black one) and have been busy doing some work on that bike and repainting my 83 gs1100e.
On the 81 I stored the origianl exhaust and put on a V&H off my 83. I bought a parts 81 1100 that I scooped the 4-1 off and put that on my 83. I also got an old school fork brace off of it that I put on my 81. Put new bars on the 81 as well.