Originally Posted by DKNYATLANTA
So, I was discussing this procedure with a BMW master tech contact of mine & he stated that he COULD do it for me but he advises against it, due to the probability of damage to the intake & turbos?? Do any of you guys that have specific knowledge of this procedure have thoughts on what he is saying about the walnut blasting?
Not likely to damage intake and turbos, but i'm pretty sure walnut blasting will create small scratches where you blast it, which will causes carbon to buildup easier. So theoretically, you would have to clean them more often.