For 1999-2004 2005 2006 GMC Sierra 1500 4.8L/5.3L Y Pipe Catalytic Converter Set

Need to replace the front cats on your 1999-2006 GMC Sierra 1500 with the 4.8L or 5.3L?

This Y-pipe catalytic converter set from goodshepherd18 is a direct bolt-on replacement.

It's made of stainless steel with a ceramic substrate, and all the necessary mounting hardware and seals are included.

It connects with the factory-style flanges—dual 3-bolt inlets and a single 2-bolt outlet.

Just a heads-up: these won't ship to California, New York, Colorado, or Maine due to emissions laws.

For everyone else, it's a straightforward way to pass emissions and get your truck running clean again.