My friend owns the GT and Lambo but he has better taste. He has a 1968 GT/CS 390 Mustand and a 1968 428/Fastback Mustang. He has a V12 600 Mercedes as well but I think his mustangs are two of the best I have ever seen. He drives them all and he lets his friends drive them all as well.

My car has some of the LET goodies.
LET 181
LET Custom Tune
LET Heat Exchanger
LET Phenolic Spacers
Johnson IC Pump
55 Intakes
LET Headers

I'm thinking about 16" high flow cats and 3" Stainless to 2 Borlas or Stromungs. I think the sound will be perfect.