I've got a new 07 GT/CS. I want to go with a different exhaust and I've listened to all of them on the different sites. I have narrowed it down to two choices. One is the Ford M-5230-GTA from Ford or Nino with an X pipe from Ford then installed. Second would be leaving the H pipe, or maybe going with another bigger H pipe later, and then the Flowmaster American Thunder axle backs. I've always been partial to Flowmasters, but it looks like you really should stay away from an X pipe with them. These are the two choices I've got it down to and I'm not interested in any other combinations. Opinions on the two? Oh, and somewhere down the line I will probalby do the intake, and maybe the shorty headers too.