So I saved the $1800 slip on bill and skipped right to the cat elim/Race ECU
Installed the DP ECU that comes with cat elim Manifold. $1200
Allready had installed Arrow manifold. O-well, will sell DP manifold
Stock Cans retained
Modified my air box cover because even though Kit DP Info says it comes with one, that is a "mis-print" otherwise known as
Ducati BS
First start with closed throttle so as to learn TPS
Starts up nicely
Warm up and take for a short ride. Wow

Instant throttle response. Better be payin attention and holding on
Also absolutly NO backfiring. I ran it up 6-8 grand in first gear and shut the throttle, no backfire, at all !!!
No nasty computer error messages. DP said it would run too rich as I did not buy the Termi slip-on.
Time will tell but my first ride confirms what I hade Guessed/hoped. No overrated, expensive Termi slip on needed here.