Ok, I'm mocking up my compound turbos. Where do I put the oil drain/return for the HT3B? I don't want to tee into the HX35w14 drain.

Also should I dump the HX35 wastegate into the 5" exhaust or leave it on what is going to become the intermediate hot pipe between the 2 turbos.

This setup is for towing, BTW

 

Most setups I've seen braze in a drain into the oil pan itself.

As for the wastegate, leave it as it is, dumping into the "intermediate" hotpipe. You'll need the wastegated exhaust as well as the expelled exhaust from the from the HX35 to help push the HT3B. Just my opinion...

 

Yep, Pull teh pan and put a drain in it. You can get it out with the engine in the truck.

 

older engine will need a oil pan tapped, newer blocks have a rear drain cast in the block.

 

I'm concerned with overspeed on the small turbo. Should I be?

 

not with the waste gate.