What's that metallic rustling from under the engine at WOT. Can only hear it with windows down. My previous WRX had the same sound, albeit less pronounced than that of the STI. In case this is only audible to me, try listing for "A quick series of small sounds" with a metallic (scraps of aluminum) noise. I babied the previous rex and got it new, so I don't see this as a problem caused by the previous owner of my STI. Thanks.