Yep, cool air is denser, meaning there's more of it to help with the burn. On turbo diesels, they use an intercooler between the turbo (where it's pressurized and therefore heated up) and the intake to cool it but maintain the pressure (for volume) and regain the density. Boyle's law at work.
The exhaust brake (mine's a Jake but other companies make them, too) is a whole different beast from the ones on the big trucks. Just a butterfly (Thanks, again Jim! I couldn't come up with the word earlier.) that acts like a throttle plate between the turbo and the exhaust piping. When engaged, the exhaust tone switches from rumble/rattle to a hollow metallic whooshing sound, different but maybe even quieter than the regular exhaust.
I use it all the time on the pickup, even running around bareback. Except for emergencies, I downshift against the exhaust brake to slow down or stop and rarely touch the brake pedal, except to finish rolling at a signal or sign. Driving like that, I got almost to 140k miles on an 8000# truck, probably 40k of that towing up to another 12k behind, before it was time for brakes. So I can understand why the truckers you refer to use their Jake even on flat ground.
That said, I hear ya on the Jakes on a big truck with straight pipes. It's a different setup on them than the exhaust brakes on the pickups. On the big trucks, it acts on the exhaust valves but, in fact, on a truck with a legal exhaust, it isn't any noisier -- like the exhaust brake, the tone changes, but not the noise level. Unmuffled, they'll lift you right out of the seat if they're near you when they bump it. School buses and OTR buses (Greyhound, Trailways) all have them and aren't the least offensive. I've ridden with my neighbor with a KW and a big Cat with enough lumber on to make 90,000#+ and even with the Jake turned up high, it's not noisy at all. It's the guys with the straight pipes that are the nuisance. With good mufflers, most folks wouldn't know Jakes even exist.
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Today's Featured Article - Identifying Tractor Noises - by Curtis Von Fange. Listening To Your Tractor : Part 3 - In this series we are continuing to learn the fine art of listening to our tractor in hopes of keeping it running longer. One particularly important facet is to hear and identify the particular noises that our
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