I have seen some pipes out there for the 600. I don't think there is going to be a lot of options because they have been already replaced by the 500 model. I think a tuner would help even without the pipe. I pulled the plug on mine and it looks like it is running pretty lean. For myself I would not put alot of money into my z6. If I really need more power, I will use the money twards a larger machine. I would do the clutchs. Not expensive and it will help alot.