If price was not a consideration, Gas or Diesel?

Grit dog wrote:
^ Are you unfamiliar with what an exhaust brake does, or just commenting on the poster's description of the occurrence?

An exhaust brake basically closes off the exhaust flow so when the pistons try to push the gasses out of the cylinder during the exhaust stroke they're pressurizing the exhaust manifold between the cylinder and the exhaust brake. That pressure then serves to slow the engine creating a braking function.

How does that create a reverse thrust? Serious question.