from my experience,
i got yellowd and work ordered, i had a 2.25" on a freekin lancer,
the cop pulled me over cos i turned my neons off,
he said my exhaust is too loud, and that my neons arent regulation ones...
my exhaust failed, blew 102decibals, i got a temporary silencer put in, ran over the pits and passed.
the pod filter isnt illegal, its only defectable if it isnt secured down to something, the wiring needs to be also secured, and in some kind of hosing, to get passed the wiring part i just ripped it all out (only neons and spotties anyways)
the only reason the spoiler would have any problems is if it does not have an eye level brake light, if you have one on the inside of your car your fine.
when i did get the sticker the license guy went through everything, i didnt get the RWC cos my rolling diameter was out by a shit load, (had 17s fitted to it, came with 13s).