Power upgrades I'm looking for a little more power. I have a 02 CTD 2500 auto s/b 2x4 with helper air bags on rear. I tow a 30' fifth wheel on occassions. I don't want to go to the extreme, just mild. the stock tranny would't hold. I have a 4" straight pipe with stock airbox w/k&n, thought about a power puck and a BHAF any ideas Thanks, Sootmanburnout