Figured I would share the pictures of the exhaust augmenters. The goal was to turn the exhaust pipe more horizontal, because the exhaust gases coming down and away from the belly is a source of drag. It's the same idea behind Conquest 1's exhaust pipes being brought closer to the fuselage. Like Conquest 1, the problem became how to do that without catching the fuselage on fire.

Enter the Exhaust Augmenter/Ejector. Here's a link with a system diagram.

We cut the exhaust pipe and fabricated a new downstream pipe, with a diameter greater than the diameter of the exhaust.
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The idea is the exhaust goes into the downstream pipe with a very high velocity creating a low pressure area in the center.
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This "sucks" additional air from the cowling into the downstream pipe. The hot air from the turbo and the substantially cooler air from the cowling mix in the pipe and are ejected out the back.
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The chevrons are something we found on one of the speed record cars, Paul Bonhomme's Red Bull Racer, and the shrouds on the new high bypass turbine engines.
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They are primarily used to mitigate the sound, but they do that by promoting better mixing of the air inside and outside the exhaust (imagine two small vortices rolling along the diagonal edges of the chevrons), which suited our purposes since we were looking to cool the exhaust gases and keep the belly from catching on fire.

Another thing we tried was copying the new Ford and Chevy pickups (you'll notice them if you know to look for them), they have a secondary cooling inlet to introduce cool air further down the pipe. So we incorporated that as well.
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I don't remember numbers but we saw very substantial reductions in temperatures on the belly (so much so it was cooler than the stock exhaust). The main draw back is they make it really frickin' loud in the cockpit.
It's not a very flashy mod, since you really can't tell it's there from the outside, but it's another one of those things that adds up in the end.