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Alan, if you have a re-circ dump valve on, i've read that you can hear that coming back through the Blitz... I've just recieved my filter, will be putting in on at the weekend!!
Piper-x induction on MY95 WRX, found fitting simple, and as above with Blitz, the re-circ dump valve can be heard loudly on gear changes and backing of throttle. In fact its also very prominent when inhaling under load/acceleration.