4.7L exhaust???

I agree with the above except in 03 or 04 dodge went to HO style manifold. The intake you'll want is 08+ piece from 300hp 4.7 with longer runners. HO cams are good they make 206 and 212 ones that are $$$$. I would suggest a 70 or 72 mm throttle body. Your 05 should already have 68mm. Replacing the Y-pipe will do wonders for exhaust. Headers don't show much gain on a 4.7 engine. Not sure if you can get a programmer but try that as well and underdrive pulley.