Microsoft Flight Simulator X: Steam Edition - 737 Extreme Sound

Summary pulled directly from Steam - Some text may only be applicable to Steam platform

The 737 Extreme Sound by TFDi Design is an accurate sound pack for the Boeing 737 NG™ series. This sound pack simulates realistic internal and external spool, real world buzzsaw/engine grind sounds, accurate battery and cockpit ambience noises, and immersive ground rolling sounds.

Also included is a custom sound gauge that can be added to any aircraft. The sound gauge adds GPWS altitude callouts, a 2D panel for controlling the air conditioning and crew notification sounds, and simulates the TOCWS.

Features

High fidelity engine sound based on real world recordings
Quality cockpit ambience
Accurate seat belt chime (recorded from the real flight deck)
Full GPWS callouts simulation
Crew notification panel
Takeoff configuration warning system (TOCWS)
Thorough documentation