To be honest with you, I intend to install a catch-can on my forthcoming SRT 392 Durango and leave it at that. These cars don't have the aftermarket support that Challengers and Chargers do, so the few bolt-ons that are out there really won't give you much bang for the buck. Sure, you could add a Legmaker, a Fastman ported throttle body, a 180º t-stat, an exhaust and a customized Diablo tune to dial them in, but do you know what you're gonna gain? About 25 horsepower. Not even noticeable on a 700+ bhp car, and your bill of sale will be around $4500. Seriously not worth it. And forget about headers. The factory units are excellent, and to replace them is a horrendous PITA.
Just my two cents from having done all those mods on my Grand Cherokee