Let me start by stating the obvious, I know next to nothing about mechanics. I know what I know from searching and this site. No matter what, I don't want a decrease in MPG, looking for better if possible but also a "sportier" ride, or at least improvement over stock. I started looking into the above and that is when I questioned, if the results are similar, what is the difference in getting there? Would all of the above be over kill? Is one better than the other regarding not having to make other mods or upgrades (ie clutch)? Just asking as I'm looking at a tune that is going to cost quite a bit and was wondering if I could accomplish the same performance by changing injectors. I have a stock 04 Jetta Wagon/5 spd., 92k miles, just had the timing belt/water pump service done. Thanks in advance-