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between the 04-08 and the 09+ cars the 09+ have a TON of small upgrades. the suspension geometry is all different, interior is revised etc etc. basically they are very similar but do not share that many pieces.
although on the other hand, most of the changes are small ones
1. the port only costs 400-600, but the engine needs to be removed from the car, and disassembled, which is probably another $1000 in labor if you're not doing it yourself.
2. a bridgeport will never pass smog, so if you need to smog the car, its not going to be legal.
3. since the engine needs to come apart, probably an engine builder
4. noise; it might be a little louder, with the old engines, you MUST have a freeflow exhaust, which tends to be loud. on the Rx8 engine i don't think its as big of a need, so it should be easier to keep it quieter.
mileage; im my experience with the older engines, a street port actually HELPS mileage. YMMV though.
power; dunno, depends on the size of the stock port vs the new one. the stock ports are already good sized, and they didn't leave you a lot of room for more, so i wouldn't expect a huge jump from a street port.
apex seals; flow of air? no. more power = more heat = faster wear.
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