Get the Direct-Fit Hoses & Clamps products you need for the intercooler system on your 2004.5-2005 Chevy/GMC 6.6L LLY Duramax. A direct-fit hose and clamp kit generally refers to a replacement component or set that is specially made to fit under your hood just like the factory component it's replacing. Many aftermarket kits feature a durable silicone construction to provide you with added durability and a long service life. The factory boots in the intercooler system are often built from inferior materials that can degrade due to heat, oil saturation, and other underhood conditions. The factory boots in the intercooler system are often built from inferior materials that can degrade due to heat, oil saturation, and other underhood conditions. A damaged or torn intercooler boot can cause poor running conditions, and reduce power! You can discover top-notch brands like AFE, BD-Power, and Mishimoto.