BGenssi Turbo Sound Maker Tip Large 30mm ReviewbP PP Genssi Turbo Sound Maker Tip Large 30mm PGenssi - Makes high pitched tone like a turbo car - It does not make the BLOW OFF SOUND, sorry.PFits most exhausts (NOTICE! If you have a lound exhaust you may not hear this product!)PExhaust ranging from 2-3 inches in diameter.P30mm sound tip - Larger than standard 25mm sold by others!PWe offer 30 day Money Back Guarantee. Please no negative feedback if you end up not installing or want a refund. We support our customers fully. Please contact us if any trouble.