I have a 95 z28 with little mods. I've just purchased some pacesetters mid-tube headers with the y-pipe. I was just wondering if I should have went with the long tube headers instead? Is there going to be much of a difference if they both connect to a single cat?

 

There won't be too much of a difference, but the Long tubes would have gotten you more torque, and they are both hell to get on. Pushing it through a single cat is what's going to be hurting your power.