I have been debating between CF and SS. I even talked to Tony a couple weeks ago to see about changing my order to CF cans. From him he stated that it does change the sound just a little to make it a little more "exotic" if you will. It just gives a slightly different note. But the SS cans give you that patented Fast Intentions note. He basically said if I was on the fence to go by looks more than what you think it will sound like as it is all personal preference.
The CF definately looks awesome and if I were going to be adding more CF accents to the exterior of the car I would definately consider them. Also if I were able to hear CF vs SS in person I would better be able to make a decision if I liked one more than the other on sound alone. But unfortunately I have to go by youtube videos as no one around here has Fast Intentions on their Z.
Getting close to getting mine and can't wait