I had that done at the dealer on my previous 135i. The result was that piston 6 disintegrated and they had to replace the engine. I can't say the blasting caused it but, I will never try it again. The blown engine was the reason I traded the car, if it had happened 4 months later, the cost would have been ~$20k.
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NB8S Past Garage: Z4, 135i. Present Garage: 2013 X Drive X1 2.8i.
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