a roush on a harley forum i cough dont like roush cough got a guy in my neighborhood that trys to act like a bad*** saying his truck is better nothing personal against you just dont like my neighbor and has just turned me off to the roush trucks but i did do a 2 sec google search for you and found this
http://forums.roushperf.com/6/ubb.x?a=cfrm&s=5926085224
probally a good site for you to check out did not do really any diging into it tho but its worth a shot just IMO
that and the truck is new and should have a good working intake roush adds all the hp stuff they can to those cars only thin IMO is to change pulleys on the charger i think could be wrong just my .2 cents
later
chris