the rasp is pretty common. i had berk hfc's on my g35 and i had the same issue. i also had a weird hiss noise on the revdown at about 2500rpm. it sounded like a rattle but it had to do with the difference in airflow i believe...ive heard much worse! i think the benefits outweigh the slight rasp though. they give that deep burble the VQ's are known for and they definitely give you moar powahhhh!!
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