I was given a 2wd auto cummins by my father when he purchased his 2006 cummins dually megacab. this is my first diesel and im fairly handy with a wrench. im putting a 4" exhaust with 6" flow thru muffler on in march and a bhaf at the same time. my understanding is that this engine is fairly simple to get big power out of and im not looking to go huge in the power dept because my budget doesnt allow me to. My only complaint about the truck is that it doesnt have any "get up and go" and with only 160hp i can see why. so my questions are what kinda results should i expect from doing the intake and exhaust? im thinking about upgrading the air horn as well... does that make as big an improvement as is claimed? also how important is the band adjustment on the auto trans? my truck has 253000 and its probably never been done. trans seems to function ok the lockup is hit and miss when its cold outside but does work once the truck comes to temp. what about the fuel plate slid forward? im looking to increase fuel mileage up from 17 and give the ole girl a little more pep in her step. there are 2 06 megacab 24v's and one 07 megacab 6.7 in my family and they all run circles around me in acceleration. sorry to hit you all with so many questions in one post but i need the expert advice u all seem to posses. this is my daily driver and i want to keep it for many years. thank u for any help you can give me to steer me in the right direction