What do you suppose this is

Engine hush kit. A lot of those old kerosene burners have them to help muffle the noise.
 
Aftermarket afterburner nozzle. Also known as the "taco bell".
 
NASA could tell you, but then they'd have to kill you.
 
Ok. I like it. Since we have the real answer right out of the chute,,,

Wrong answers only.
 
It's a tandem-mounted helper engine.
 
The rear one is the real engine, but it's too small for the N number, so they kept the original engine to display the N number.

Or maybe it's a super complicated sensor package to determine how an airfoil creates lift?
 
It's the water heater. That flight between Houston and Tampa requires a lot of hot coffee.
 
They were intrigued by the Raptor's approach of having one turbo feeding a second turbo...and they figured they'd try the same hack with their turbines.
 
Turbocharger. Thins the mix. Gives it an extra 50 rpms.
 
The result of hot-section envy.
 
We can send people to space, but the people in charge of doing it are still flying around in a G3.
 
Bunch of idiots on here.

It's the new sustainable GE XP 980, with built-in ozone generator to help fix the big hole. The engine also runs on cooking grease. Just 4 million more of these babies and climate change will be a thing of the past.
 
HAHAHA!!!!
We need a weekly "Wrong Answers Only Thread.
This is hilarious.
 
Mark IV Magnatomic Flux CO2 sequestration unit...
 
The very rare in-flight washing machine with dryer attached. The spin cycle is a real treat. Gotta have two loads so you can put one on each side or the plane flies real out of wack.
 
The front engine is electric. The thing on the back is a turbine-driven generator that makes electricity to power the front one.
 
Drag chute container for use in case of brake failure.

Cheers
 
It's obviously the fart vaporizer. Lav in rear, only used after Taco Bell.
 
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