Patriot Exhaust H1135 3-1/2" Exhaust Cut-Out Hookup Kit Stainless steel construction electric exhaust cut-outs in 2 1/2 inch and 3 inch diameters Rugged gear reduction 12 volt DC motor and a rotating gate for a leak proof seal A pre-wired harness with an illuminated rocker switch is supplied for easy installation Un-cork your exhaust with the flip of a switch from you dash Ideal for race tracks that do not require mufflers