Big Gun Vortex Quiet Inserts are designed to help tone down the overall sound output of your exhaust. Vortex measures 2" and reduces sound by approximately 4-5 dB. Vortex 2 measures 5" and reduces sound by approximately 6-8 dB. Installs in minutes. Very slight, noticeable power loss.. Compatible with the Big Gun Exhaust Spark Arrestor, P/N 622484, sold separately. Compatible with most Big Gun Exhaust Systems. Vortex 2 Vortex 2 Insert, 5"