I had a chance to get the new pipes on and try them out this weekend.
Wow
This was the best modification that I have done so far!
The sound is not bad, nice thump at 750 and after 3000 rpm the FE comes a live. No crack or popping. No cone used but I did have the ends of the mufflers domed down for a smoother transition. Thanks to John, Zack and Nick for your help.