thanks guys for the kind words.... Yes, the old valve springs.......personally I have not worried as I have only as much power as my standard injectors can handle. If you are considering bigger injectors, then yes definately! Probably the most important thing on that list I would say is the front lower control arm bushes! Do them before anything. They are actually dangerous. You will think its brake shudder...BUT ITS NOT......... I have seen four B Series falcons have this problem just recently, and a couple of them including me nearly got into strife at high speed. I was comming down the gateway bridge in Brisabane and all of a sudden a small wobble began in my steering. Then the wobble turned into a violent bloody wobble making it hard to stay in my lane. Keep in mind im doing 100kmph down a steep decline. It was not pleasant! Replace it with the super pro item. Also you will find the ford ipod booster and the ASL item I described are very similar as is their price, except for one thing! the ford item does not have a switch for noise reduction. I have heard complaints about the ford item for this reason.Something to consider. And dont bother with the passive ebay ones, they have no volume, they are sh*t. All of them hook up the same way as each other, so dont worry about ease of installation!