here’s some worthwhile archive threads to read
http://www.pittspeed.com/forums/showthread.php?t=5021
http://www.pittspeed.com/forums/showthread.php?t=8776
http://www.pittspeed.com/forums/showthread.php?t=18305
http://www.pittspeed.com/forums/showthread.php?t=21738
http://www.pittspeed.com/forums/showthread.php?t=24512
http://www.pittspeed.com/forums/showthread.php?t=27650
http://www.pittspeed.com/forums/showthread.php?t=29417