i'm obviously not into modding my stang' for the gas mileage, but i was just wondering since i bought a new mid-pipe. its a catted h. do you think my gas mileage will go up or down? i've heard both arguments but was just wondering if anyone else had any experiences

 

Thats a tough ? I don't think anyone could tell for sure and you'd later tell on down the road after the install and watching the fuel. On my s197, the mpg went down a bit after going catless?