i dont really know where to look for this and i know this thread is old but might as well put my first post somewhere, do you know where i can find any performance coils for my my 03 6 s? i read about the granatellies but cant find them anywhere or the msd stacker 8 any help would be great thanks!Cold Air intake, go with the CPE mafci. Its the most expensive but worth it. Optimized Throttle body from TwoWheelin/Cordova Motorsports. CatBack Exhaust (no gains but good change of sound). Id strongly suggest headers if you have over say 90k on the car because there have been a lot of 3.0 failures due to plugged precats. The lower wishbone motor mount is a nice addition as well.
Maintenance wise, Id change the PCV, spark plugs, fluids, etc.
Really just :search: and all of your mod needs will be filled here.