What is the cheapest way to add 120HP to a daily driver. Daily driver reliability and durability required.

 

Plug and play... something along the lines of Edge Comp or other programmer of your choice. Must have supporting mods or you will spend more money and time fixing the truck. I really don't think there will be any single modification that will give you 120hp without some sort of parasitic loss... Many options.... but, start with the search function and also consider other forums. There are seat of the pants power and actual power. Best of luck in your search....