Exhaust broke then grr

2.0tdi quattro here. 

Had the dpf removed and egr blanked, then a stage 1 map to remove them and a smidge more power. 

Everything was fine. 

Until the bracket between the center and back pipe broke. Dropped the center pipe on the road and dragged it a bit. 

After that happened. The oil sensor light kept coming on, brake light (dash warning comes on), back lights out flash on (occasionally).

Wiring sorted now.

But my biggest !Removed! off is. 

I used to like the 'woooooooppppppppp' when changing gear, but that has stopped.

Could the pipe breakong have naffed the turbo or something?

It still whilstles and stuff. But not the 'dump valve'.

Sorry, I am a Land Rover man, so this is my first Audi.