well, having done most of the stuff on your list, I cant argue with the fact it does increase the performance. the point Im making though is that for 99% of road use, the increase in performance from doing these mods is a waste of time, because you can hardly explore the limits of the standard car on the road. So for me at least there are two clear paths to follow with a cup. (1) Regular track use, in which case mods make senses but not your average road warrior mods (Track priority is suspension, brakes, then engine - not the usual order) . (2) if there is no track use involved, keep the car standard and save the money.