Sorry...I made the classic mistake of asking for help without giving all the info.
The truck is a 2007 Ram 1500 regular cab 2wd. I need it to be reliable and run 89 octane gas. There have been street legal headers made for these trucks as far as I remember.
I do tow but not all that often....Usually just junker cars I bought or parts cars on a tow dolly.
It has 22" wheels and a 3.55 gear. I intend to swap to a deeper gear since when in OD, the final drive won't be terribly different than it is now.