[dcbuckmiller]

My son has a 2010 BMW 335xi with about 105k miles and hired his so-called mechanic friend to modify the exhaust system and install some type of blow off valve. He left the project incomplete and now the turbo lost power. I took it to a professional mechanic for evaluation and repair estimate and this is the inspection report:

Vehicle arrived after someone installed catless downpipes, and attempted to install a blow off valve. Left multiple ports open including where map sensor should be installed. Hose clamps all loose, vac lines no where near routed correctly and had HVAC tape holding intake pipe to throttle body. Underneath Vehicle found all the o2 sensors just hanging not installed in down pipes, and plugs for o2 sensor locations not tightened at all. Whoever attempted the install on the downpipes cut a reinforcement section out of the subframe instead of dropping subframe. Will need replacement subframe and stiffening plate, downpipes need to be removed to have o2 sensors installed. Turbos are also leaking oil from case halfes of turbos so would rec turbos at the same time along with all new o2 sensors as the have been subjected to road debris.

The repair cost quoted was 10k and likely exceeds the value of the vehicle. What options do I have with this car?? Please help!