I am in CT.... I did ARH long tubes with high flow cats...I also have the magnaflow 16869 cat back exhaust kit.
One recommendation I will tell you is get the headers and y pipe ceramic coated inside and out! This is way to go...cost about 300/375 but totally worth it for heat and flow....once these babies are installed you don't want to screw with them. I also used new oem gaskets and stage 8 locking header bolts.
My ram dealer installed them for me...ARH bolt right up...you just need to adjust the oil dipstick. They charged me $500. Well worth it....then get hemifever to tune it for you....next clutch fan delete....and 180 stat with the ATI dampener pulley....really wakes truck up! I just ordered a pedal commander that came in today....got a new tune from Sean so I can now adjust pedal response 36 choices on the fly. He has a special on these $269. Do the headers right the 1st time it's pricy but worth it...I have had them for 2 years now. Oem manifolds suck a$$.