Hi fellas, I was just wondering if anyone can shed some light on improving performance. I have read a lot threads about people who have upgraded via chips or reflash but have not really found any who were unhappy with the modification.

With a reflash, the ECU is changed via a computer, and can only be changed back to factory settings by connecting to the same computer again? A chip such as the DP can be unplugged if factory settings are required. Is this correct?

What is the cost roughly for either of these options? Are we talking a few hundered or over a thousand dollars?