Anybody know what these parts are?

[chazd1]

I got my M998 back from the shop with new heads and water pump.

There were a few "extra" parts in the back that weren't there when I brought it in.

Anybody know what these are? (Attached)

 

[Dieselmeister]

I got my M998 back from the shop with new heads and water pump.

There were a few "extra" parts in the back that weren't there when I brought it in.

Anybody know what these are? (Attached)

The galvanized piece is a heat shield that goes over the exhaust manifold. P/N 12339175. there is another small piece that goes on the end.

 

[HUNvee]

This is the part that generates the noise.