Banks Power 04-05 Chevy 6.6L LLY Banks Speedbrake (w/ iDash 1.8)The World's First All Electronic Braking System. Cuts downhill speed up to 78 percent. All automatic, user selectable speed. Simple plug n play installation, no cutting or welding required. Extends the service life of your brakes, and does so while maintaining your sanity. This Part Fits: Year Make Model Submodel 2004 2005 Chevrolet Silverado 2500 HD Base 2004 2005 Chevrolet Silverado 2500 HD LS 2004 2005 Chevrolet Silverado 2500 HD LT 2004 2005