exhausted :) what system to install?

On my 06 charger srt8 with the 6.1, i put 3" cat back on it with a x pipe with flow masters and it was a little better on flow and power. The cut out i would keep before the x pipe, leave the x where you have it. If I were to do it again I would use dynomax ultra flo muffler instead of flowmasters.