This unique design allows Our Banshee pipe kits to be used in noise sensitive areas, without killing power like all other systems do. Using this Husk Kit, Banshees which normally produce measureable decibels in the 96dBA range, in racing trim, when being measured by US Forest Service Personnel, will read in the area of 86dBA, WELL below the limits of USFS. Also includes our unique and USFS approved Spark Arrestor as well. Double the compliance and no loss of power!!!