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taken off hks site
"The HKS SSQV silver triple-fin discharge design produces a powerful and unique aggressive blow-off sound along with added visual distinction. Additional triple-fin inserts are available in gold (standard high frequency sound) for visual appeal and in purple metallic (emits a lower frequency sound than both the standard and gold SSBV inserts) for an alternate sound and appearance. SSQV inserts are easily interchangeable within minutes."