Why are these gaskets differently priced?

[sickfleming]

What is the difference in upper intake manifold gaskets and intake plenum gaskets on a Duratec V6?

I pulled off the aluminum intake manifold and I need to replace the gaskets underneath now. But Autozone has an intake manifold gasket set (upper and lower) for $45, and an intake plenum gasket for $22. What is the difference between the two?

[MasterTec]

It's a two piece intake. There's the upper section (aka plenum) and the lower section.

The $22 plenum gasket comes with just that - the plenum gasket.

The $45 gasket set comes with the plenum AND the lower intake gaskets.

I can tell you from experience that unless the plenum gasket it torn you'll probably be ok just reusing it.

[sickfleming]

Yeah, I heard that too. It's hesitating and the engine is surging so I assume it's torn. Or it's the IAC gasket or EGR gasket needs to be replaced. Thanks