We have a few Magnaflow systems left. 16725 is for a 2007+ Chevrolet Suburban/GMC Yukon XL 6.0L 2500, Single Side Exit $150 Shipped to the lower 48! 17945 is for a 2006-2007 Long bed Duramax. System is a cat-back system. Box is opened but complete. $150 Shipped to the lower 48!