Look through the vendor section here for EFI Live tunes, most all of them do an ECM exchange program for a decent price. If you just want a little power with a fuel mileage gain then a 60-80hp tow tune is really all you need, and should keep the trans happy.
Leave the intake stock, its fine. I made 500+hp on my stock intake. 4" exhaust is plenty big enough, brand doesnt matter its all steel pipe anyways, but you might look into stainless if youre going 300k miles.
You dont NEED a lift pump to run a tow tune but itll help. Airdog, Fass, and Kennedy are the most popular brands.
Leave the intake stock, its fine. I made 500+hp on my stock intake. 4" exhaust is plenty big enough, brand doesnt matter its all steel pipe anyways, but you might look into stainless if youre going 300k miles.
You dont NEED a lift pump to run a tow tune but itll help. Airdog, Fass, and Kennedy are the most popular brands.