i would suggest to take it to gavin woods first, then if there is any damage, take it to your insurance company and get them to assess it, im assuming you got the person who hit you's details
to my way of thinking if the exhaust itself was shunted fowards then its very likley the turbo may have been delt a pretty hard hit, as there isnt much that anchors the exhaust besides rubber hangers....
also turbo gaskets are very temprimental i hear
really bad news man, hope it comes out ok