Our OEM Kenworth Parts are the exact same ones you will find from the dealer. There will be no difference in Size or Quality. All of our prodcuts are made right here in the USA. You will find that we can get just about any pipe that is on the market today. We have Kenworth, Freightliner, Peterbilt,Western Star, and Ford. Clamps are required (not included). You can find our clamps in our store if you need them.