When the engine exhaust passes over and through the catalyst coating, a chemical reaction renders the nitrogen oxides, carbon monoxide and unburnt hydrocarbons harmless.

A standard test for a diesel's particulate-matter emissions passes the engine exhaust through a micropore filter.

Tests show that air forced into a jet engine exhaust stream can deflect thrust up to 15 degrees.

In addition, the canopy was reinforced with two external frames and a small fairing was installed above the engine exhaust.

Flares are commonly composed of a pyrotechnic composition based on magnesium or another hot-burning metal, with burning temperature equal to or hotter than engine exhaust.