I know I have flowmaster mufflers cuz I got under the car and looked... but how would i tell if it is an actual catback exhaust or if it is just the mufflers welded in?

 

look at both ends of the mufflers for welds... if not welds then it's a cat back... and if all the bends are mandrel (no creases in the inside of the bend) then it's a cat back... if the pipe is not mandrel and there are welds on both sides of the mufflers then it's prob. just the mufflers...