Gas that is. I went from 15-17 mpg stock to 12-14 mpg with a 4 in ram air and a K&N filter. I swear I watch the gas needle go down. I drive this truck every day for work. I think I need that resistor to trick the computer cause the actual air temp here has been around 30 degrees.m The computer is dumping gas in to richen it thinking the truck is still cold. But I tell ya the power is noticeable. I feel prety confident that I can beat most street cars where I live. Keep in mind Audi is a deformed belly button here. And Saab is what yer girlfriend does when yer drinkin.lol Anyways, I think that the resistor will kinda nullify the ram air, which its purpose is COLD air.My intake is in the pass fog light opening and is ducted into the bottom of the stock air box. This way it looks stock under the hood and it wails like a banshee when I press the go pedal. I'm hoping that if I put exhaust on with a X pipe, that might help. Good flow in, good flow out, good horsepower. Please comment on this, as I take my mods seriously. I have the only SSploder in my county.