I bought one of those K.A.T. Matrix 3-Axis Accelerometer - kinda a cheap version of the G-Tech. I have a '05 roadster with a sprintbooster. not sure if that helps or not but this is what the K.A.T. gave me:
1/4 mile:
97 mph
14.87 second
135 hp
154 hp

0-60:
6.34 second
141 hp
161 hp