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You can install the RB intake duct with the stock airbox. This is probably the best "bang for the buck" on intake. You won't see huge advantages on the dyno, but at speeds on the track or highway it will keep your intake temps down. I run the stock box w/ a k&n drop in.
Using an access port is definitely worth it, but in my opinion, its not worth the cost if all your doing is a drop in filter and catback. The stock tune will work well with those mods. If you've changed coils, aren't running a cat, etc... this is where the AP shines.
I'm probably going to add some heat deflection material to the intake box and duct to avoid as much heat soak as possible in the grid (I auto-x the rx8).
With full exhaust (headers, high flow cat, and catback) with the RB intake and duct and better Bosch coils, I've seen the reni make 194whp. Best power I've seen so far. I know others have posted up 200whp or more which is PROBABLY possible, but it would take a very healthy engine and the right combination of parts. That same rx8 making 194whp has an AP but no tune yet... I'm sure there is still some power left to be had... but 200whp may be a stretch.
I will be redynoing my 8 in another month so I hope to try a few different tunes to see how it works out...
Long story short, if you want big power in the 8... you'll need FI.
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