Yes its the normal old everyday HX40 Duramax downpipe, same as you would use. Why re-invent the wheel? HX40 is not a 3" V-band by the way, its 3.8"... The HX40 pipe is easier to install with a motor in the truck, and fits better than the one piece ATS. Plus its a Fleece Kit, intended for use on a Fleece charger, which would have been cut for HX40 to begin with.
Caleb
Thank you for helping me explain it lol. Nothing wrong with the kit just have to change the vband not a big deal at all. The kit looks awsome Caleb.