Mods and gas mileage question
So I got a 2.5 and when I put oversized tires on it, my gas mileage went to crap, which is fine because I like the tires but it has made me apprehensive about the other mods I wanted to do.
One being putting a diamond plated toolbox in the back, would that weight effect my truck too crazy? I don't even know how much those boxes weigh honestly
Secondly, a 3" body lift. How much would that kill my mileage?
Also, if I wanted to get an aftermarket catback on my truck and didn't want it to sound like a Civic, what would you recommend? Doesn't need to be loud just a little more noise than it has stock with a CAI.
98 XLT Daily Driver, 115k