LS1 vs. LT1 Catback differences
 

Whats the difference between an LS1 catback and an LT1 catback? How hard is it to put an LS1 catback on an LT1 car?........

The LS1 has more mounts for hanging and the driver side hanger is slightly off. I have an LS1 Magnaflow cat-back on my LT1. I cut the 2 extra hangers off and bent the drive side hanger a little and it fit perfectly.

cool, so all of the bends are the same?

The main difference is in the connection to the cat. Since you're running a 95 single-cat car, there is an S-bend at the front of the intermediate pipe that allows it to line up properly. If you look at the SLP install kit for the Loudmouth, you'll see that it includes a short, S-bend pipe and an extra hanger for the driver's side tailpipe. The required modifications will really depend on the catback in question.