did mine over the weekend. I installed the TB first (no spacer, no port matching) and drove it like that for a day and a half, decided to port match the intake, but i didn't notice much of a difference really. I'm not running a spacer at the moment, but i can certainly feel a difference on the lower RPM range from about 1200-2600 and it seems to be "smoother" overall.
Definately a must do.
Cost...FREE (helps to have friends with parts jeeps :wink: )