Yes you can run them under a cover .
make sure you get water jacketed exhaust housings.
That'll be the kicker to find along with the water jacketed exhaust elbows.
let me dig through my pics.
-beerjet-
Here are the ones I had .
(https://www.socaljetboats.com/cpg/albums/userpics/10034/turbostuff013.jpg)
It didnt hurt that it was a complete Gale Banks system. ;D
Here it is with the Exhaust elbows.
(https://www.socaljetboats.com/cpg/albums/userpics/10034/turbostuff015.jpg)
-beerjet-
Beerjet - I assume you don't have them anymore ...
Spectra 81 has them now.
He's actually gonna use them. :-\
-beerjet-