Yes the smashed exhaust is a concern. The whole cat back needs to be replaced. This comes as a one piece assembly. Unless you want to have them cut the extension pipe and tailpipe off and weld another one on. i am not sure how you arranged this, if it is a legitimate company they should have insurance to cover their driver employees. Do you have a contract with them?

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2013 BMW X6M-current
2013 Audi S4-current
2007 BMW X5 4.8i (E70)-sold