Would I need a tune with the HOLDEN EFI VX-VY V6 ECTOTEC CAM AND COMPUTER PACKAGES? http://www.maceengineering.com.au/epages/shop.sf/en_AU/?ObjectPath=/Shops/mace/Products/CCP638/SubProducts/CCP638"

If you were to purchase one of these kits from the provided link, then a re-calibrated/tuned computer is included. Please note though that these tunes cannot take into account engine mods such as a stroker or a larger MAF. These mods would require a custom tune.