Remember the car is "Drive by wire", meaning you must use a Dynapak or similar dyno that spins all 4 wheels equally otherwise the ABS/ESP will offset throttle, timing fueling etc and your results will be tainted. If you have access to a Star Scan you can defeat this by setting it in "Dyno" mode. Forget pulling Fuse #17 & 18 as this will NOT completely defeat the traction control and can cause an over rich "limp" condition. If you cannot find a proper dyno or Star Scan then it is best to gather your logs via OBD or quality gauges with logging capability.