Does anyone have any negative experiences with carbon fiber cans? I am in the market for new slip-ons. I have the Akra titanium hex with the carbon tip on my 10R. The tip has become less black, kinda greenish in certain light, obviously from the heat. Just got a Black '07 ZX14 and want to replace the torpedoes. Thinking if the Yosh TRC's, all carbon. Don't know if the finish is going to withstand the test of time. You're input would be most appreciated.