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They don't suck in water in rain, they suck in water in deep puddles. So don't drive through deep water if you get an intake, but to be honest, that's pretty good advice for any situation.
Though I will say, intakes on the 8 do little to nothing. You may want to stash that money for a while and put your money toward something better suited to the 8. I suggest an exhaust. It doesn't really do anything power-wise but man I love the sound of the RB and Greddy setups. If you want performance go suspension.
07 True Red Mazdaspeed 3
With the AEM or MazdaSpeed CAI there would have to be water halfway up your door in order for the intake to suck in standing water. Possible, but that would be the least of your problems.
The good news is you cannot hydrolock a rotary motor.
I have, however, gotten enough water into my AEM that it caused some crazy Mass Airflow problems such that I was getting rich misfires. I found anything above 6,000 RPM's would cause problems. So as long as I drove like a normal person in the rain there were no issues.
just get the K&N panel intake for 50 bucks. That's what I have, and its just as good. Spend the money you save on something else.
This is really the best advice you can get. The stock intake is already very well designed and the best thing you can do is throw in a better flowing filter. The K&N will only make your car run worse due to the short ram design pulling in hot engine air. I traded my K&N for the AEM cause I needed near ambient intake air temps due to the hot phoenix summers.
Buy a drop in, save your money...your RX8 will thank you for it.