I fitted a Y-piece and a Techlusion R259 to my Adventure around 6 months ago. I installed a Remus Titanium end can about two months later ( to cut down on the backfire ).
I noticed the following:-
• My bike runs smoother with the Techlusion unit in place, but it runs quite a lot richer
• My bike is more responsive with the standard end can. The Remus does not feel as responsive but it has eliminated 90% of my backfires
I can noticeably feel the difference when adjusting the Techlusions setttings with the standard can, but with the Remus, adjusting the Techlusion doesn't seem to make much difference. I will probably go the route that Mike has gone - Y-piece, Techlusion, standard end can and a visit to the dyno.