Evo: Ceramic coat the Turbo parts Drive it, clean it, drive it, clean it and Repeat then cover it for next winter all while maybe putting 2k miles on it.
E55 AMG: Install the $3k headers I just bought NO there is no typo. Mods are not cheap for it. buy a set of 16 inch wheels and mount ET Streets. Retune and make 600+ Wheel Tq in a 4 door MB with cooled seats
GSXR 1000: New clutch, New paint (gotta change the color for the season) and get a Shinko Hookup
GSR:Its my Beater. Take the winter tires off, mount powdercoated stock wheels, Wash it, Drive it.