Id get rid of that old memcal and fit another original holden memcal that has an original holden tune that was released for your model etc. You can usually tell if a memcal is original or not by the little silvery foil sticker that covers the little round window that you can see on top of the chip, its used for erasing the eprom chip with UV light,so is usually covered by the sticker. That foil sticker I mentioned before has four letters written on it, the four letters are actually the version or the type of factory tune , once this little sticker is removed from the memcal,(so the chip can be erased and rewritten to again),then it wont stick back onto the chip again unless you use glue to glue on it, (which you wouldnt want to do). So if the sticker is there, you can be 99% sure its genuine, so has probably not been tampered with in any way. That memcal in your picture has no ID sticker over the round window on the chip, so god only knows what changes have been made to it, and by god only knows who. Theres a lot of dodgey people around who try to sell these so called tunes for heaps of cash, when they are plainly just not worth what they ask for them, "well,a lot of the time theyre not anyway", and half of the "so-called" tunes Ive opend up and looked at, or have copied from someones memcal or whatever, all have nothing that special done to them. Anyone can buy the hardware off ebay, download the programs needed, and learn about what needs to be changed etc on the memcals bin or binary file. Delcohacking is a good site to start with if you want to learn about this kind of stuff.