C15 Severe Coolant Loss

I am not familiar with other engines, but I believe that the transfer pump on my BXS has a maximum of 125 psi, so without getting into something way over my head, I will keep my fuel pressure where it's at.

 

Update on bolst low pressure. After checking, rechecking and then checking again, I could find no leaks on the intake system. So I pulled both turbos off a d gave them another look at. When I took the casings off of the turbo with the actuator on it, I found cracks in the cast iron where the fins spin, just below where the steel shield fits in the casing. The bearings were worn zome and one shaft was showing some wear. Two new cartridges and replace the damaged casing. The parts will be here Friday, so I can put this problem to bed! I knew I would find it if I dug into it. Thank you to all, again, for the help.

 

I'll get some photos tomorrow. The cracks are not visible from the outside.

 

This is what the exhaust side of the turbo with the wastegate looks like. Not catastrophic damage, but it was not going to just go away. In the third picture, you can see where the fins were just starting to contact the casing.

 

I guess this would be one of them as well, even though it took 1.4 million miles to crack. The turbos are one of the casualties of the coolant draining out the stack. When I get a break in the temperatures, I will put it back together and fire it up!

 

When I did the rebuild, I removed the rusty brackets that held the stacks in place. The truck is very quiet with just the catalytic converter. I would like to get a nice low rumbling sound. Nothing I need to wear ear plugs for, just loud enough so I can hear the cat growl a little. Any suggestions?
P S. I don't want ANY muffler with bearings! I already how much maintenance is required