Played with it a bit more last weekend. I verified the EBPV is working fine with the decel tune. Not sure why I couldn't get it to work earlier. But it is attached and working.

I noticed a bit of black soot near the top of the drivers side up pipe, so I went ahead and changed the gasket. No help.

I'm out of ideas.

Truck has no exhaust leaks, no charge piping leaks, a new air filter, new banks wastegate head adjusted more than enough, turbo impeller feels great, 4" straight pipe exhaust. I can't think of anything else to check.

Anyone out there got anything else I can try?