Arduino-Based Sensor Data-Logging

We are making a PEMS (Portable Emissions Monitoring System) - See [login to view URL] These systems are commercially available, but difficult to obtain. Some examples are; [login to view URL] [login to view URL] [login to view URL] [login to view URL] The sensors involved are off-the-shelf units that normally reside in an automobile and communicate with the vehicles ECU via a CAN Bus (Controller Area Network). Examples are as follows; NOx Sensors [login to view URL] Pinouts [login to view URL] O2 Sensor [login to view URL] Particulate Matter Sensor [login to view URL] Flow Meter [login to view URL] [login to view URL] We wish to assemble a 12 volt system that uses these sensors, connected via CAN Bus, with the Aurduino performing monitoring, datalogging, and communications with a PC for data analysis. GPS Datalogging essential. In summary, a system that is portable, attached to an automobile, that takes emissions data from the exhaust, combines it with time, speed, GPS data, and puts it in a format that can be retrieved, manipulated, reported on, etc. SQL Database?