all i have in mine is
the zl-ve manifold(header),
silver spark plugs,
mazdaspeed original springs,
royal purple oil,
redline synthetic auto trans fluid, (notice i listed fluids, they are just as important as hardware.
i ordered a simota intake, will get that next week(no hesitation),
what else boy???...hmmm
well i condemn the egr line when i put the zl-ve header
i also have a HKS Super Drager exhaust(believe it or not, i did add a lil somn, noticeable)
i have the sway bars, but i trying to source bushings for it so i can install it
also have the strut tower bar, looking for brackets for it(not installed)
if the sport 20 back shocks longer than the ones i have, I'll have a pair of those weekend...
i currently looking for a complete zl-ve head to buy, to start some work on(polish ports etc.)
and i line up a thunder 4-1 header for when i install the head(claimed 7whp with stock exhaust), going to upgrade exhaust before head though...
hope the above gives you some ideas of what mods can be done, if you wanna go more hardcore, manual and thing, check villain, he is the zm man