As for the angle of re-entry... that is to not slow the exhaust flow in any way (which could case lag), correct?!?
Not to make a turbulent entry of the exhaust, if too close to the turbine wheel can cause the turbo to slow down.
The further downstream from the turbine wheel the better.
Minimum 18" to re-enter the wastegate exhaust back into the downpipe.
I had planned on having the exhaust system installed before I figure the wastegate return.
Would it be the end of the world to vent to atmosphere? Noisy, yes. But drawbacks?
No, it would be fine, just is loud and sounds like A$$ IMO 
No drawbacks, gets soot wherever the exhaust is pointing.
Any specific pictures required?
