At this point, I haven't heard good results for any Air Intake for the RX-8. The best ones I've heard of thus far are the RB and the HKS. In general, an intake swap tends to be a "noise" mod. Same seems to be true with a cat-back, although mated with a good midpipe or high flow cat, there are gains to be found there.
Manifolds/headers. RB is still working on a header, and that may be ready by summer. Rotary Performance has a high flow cat that I may be going with down the road.
I know if I'm looking for large power, it'll have to go FI.[/b]
I hear ya man, most intakes on Subaru's aren't worth much either, or if they gain a few ponies just due to the fact they change the size of the MAF housing to lean the AFR's out. On a close to stock WRX/STI, tuning with an intake, is usually only good for around 1-3whp over the stock airbox... but as power increases, the stock airbox becomes more of a restriction.
An intake on an RX-8 probably won't do much, although you might be able to eek out a couple extra ponies after tuning for it. Who knows?!?
