I got the car back yesterday and did quite a bit of driving on it. There were no new noticeable differences in power, the only differences i noticed was that it took my lights 5 seconds longer to come on when i hit the unlock button on my key, and that the stereo does sound better now. I put the JB3 back in because i couldn't stand having stock power for more than an hour
as for my build date, it is a January 2010 build