My Truck,2009 Chevrolet Silverado Crew Cab Short Bed is just weeks old and was interested in a Stainless Cat-back Muffler from Magnaflow. The Muffler system on most of the parts web-sights list Part #16740. The muffler has changed in production from GM. The new part according to Magnaflow is #16567 and will be available soon. Just thought this might save somebody some time and frustration.