Magnum Mania!

Ive been looking all over youtube for this version of the MPI theme, but I only found it in one place. Can someone tell me from what season it is? Heres the link to the theme Im talking about.

http://www.televisiontunes.com/Magnum_PI.html

I want to say that may be from Season 5 "Mac's Back". They experimented with the main theme a few times throughout the show. I also believe that they may have tweaked it in season 2-3 for an episode as well.