exhaust recomendations

I already have the dougs heads on my 416 stroker motor. I recently picked up a dougs 3" Xpipe. Before I go ahead with this, I read that the 3" pipes are very hard to run all the way out to the rear? As an option I was thinking 3" Xpipe with mufflers and then changing to 2.5" after the mufflers all the way to the rear tips? Has anyone here done such a setup and what mufflers would I use? Offsets?