11/16 is 0.6875 so altogether its 1.6875
Should slip over the manifold :)
if this slips over the manifold mate then great gut does will the exit bit fit on a 2" centre (middle bit haha)
Manifold looks just over 1.5'' so it should haha
For the back bit I'm not so sure, i know you can get pipe enlargers and reducers to make it go from 1.75'' to 2''...
I'll let someone else answer that lol