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Well got the bad news, technician says the knock is diagnosed as internal and likely in the block not the valve train, they quote new engine at $9,300.....LOL. Not sure I buy this diagnosis considering how well it runs and no codes. But looking like it's time to replace. Would hate to do a timing job then still have the knock.
Appears all the new Expy's have the 3.5 twin turbo, questioning the lifespan of the turbos and motor with the high pressures they run.