Factory OEM GM collector merge two into one pipe. This came off a 2005 Silverado 1500 4.8 V8. In good condition, very solid with just some slight surface rust, very usable. Factory right rear sensor bung location. Remains after cat replacement. Cut off about midway on the left crossover pipe, and right behind the right converter. Overall length of crossover pipe from cut to face of flange is about 27". Pipe I.D. is about 2-1/4", flares out slightly on the right pipe where it connects to the cat, and slightly oval on the left pipe where it crosses over. Flange stud bolts are in good condition, and are 10mm and about 5" center to center. See pics for details.
Replaced with a 93419 Magnaflow cat kit.
Magnaflow website says its kit works on:
1999-2007 Silverado
2000-2006 Suburban
2000-2006 Tahoe
2002-2006 Avaslanche
2000-2006 Yukon
2002-2005 Cadillac Escalade
1999-2007 Sierra
Can't guarantee this part will it fits all these models.

Check out my other listing for the flange pipe that connects to the right exhaust manifold and upstream of the right cat. Happy to combine shipping.