What will go pop?
The motor?
Mate - get the exhaust fixed. Drive sedately to tuners (or have them do the work on-site if possible), run it up and have a look.
There is no way around this. Your motor will simply not just up and die from an exhaust change, however the tune MUST be looked at with such a restrictive exhaust. You will hit load points that you weren't previously.
Also that tune, is honestly looking pretty average. The curve should be much smoother. Is the right axis is toruqe, then its 100% a poor tune as its dropping around 104-120, but then that could also be the exhaust.
Overall moral of this story? Get the exhaust fixed, and get the tuner to have another look at it all.