Originally Posted by Ender.
Thats interesting... Im pretty sure John is running the JDM MR Diverter Valve with no problems. An air filter shouldnt cause problems though is my thing, good luck, hopefully someone else can chime in.
Actually they say aftermarket intakes screw up the airflow to the MAF in a lot of the newer cars. I've not spent enough time on those boards to know if it's true, but I know that it's something people say happens to WRXs, STis, Evos, SRT-4s, etc.