LOW FREQUENCY INSERT: 2005 Subaru Impreza WRX STi with HKS SSQV blow off valve

Another under hood look at the HKS Super SQV on my ’05 STi. This time I swapped out the valve piece to the purple, low frequency insert which produces a much deeper blow off sound. Check out my other vids to see the high frequency insert and this blow off valve recirculated to return the air.