This may sound like a dumb question to you late model guys but I am an early model Mustanger; as you can see by my signature; but I have a 93 Mustang Coupe that I am setting up to drag race. It came with a 4 cylinder/AOD and I am putting a 351W and C4 in it. I was looking at the Flowmaster 3" exhaust system and was wondering what is the difference between the LX system and GT system when both call out a 5.0? Which one would fit my car.