Track pace c63s
Personally, I'd recommend a different approach such as an XGPS-160 and an OBDlink with Harry's LapTimer (or one of the many other similar apps now available) or, if you're serious about track days and/or racing events, get a RaceCapture unit. These allow easy data export for analysis and use in tools like RaceRender.
Depending upon what you're trying to achieve, these days there are many different options available for capturing the car's telemetry and creating data-overlaid videos. Rather than spending a lot of money to get Track Pace, I'd start with one of the cheaper solutions and spend the money on brake and tire upgrades (brake cooling and wear are the big issues with a C63/S).






