The issue is one of causation. You have to demonstrate who the negligent party was. It would be something like this...But for the tuner putting that tune into the engine, the engine would still be fine. Or but for the engine builder not applying the proper torque on assembly, the engine would still be fine.
Two legal avenues either: tort law for duty of care (negligence) to recover damage; or govt fair trading dept for same.
good luck.
This does not constitute legal advice. You should consult with a lawyer.