Keeping your existing elbows? Then a lower stack is what you need to complete your semi truck monster stacks. Lower stack is to be used with OEM 5" elbow. Add your top stack length to lower stack length to get your total stack length. Lower stack has a Taper Lock top, giving you a seamless look and the flexibility to change your top stack or lower stack independently. Fits all truck makes. 6" diameter reduces to 5" diameter, 52"L. Tapered top, expanded bottom. One year manufacturer's warranty.

Sold individually.