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Thats because it is normal for turbos to have blow-by due to higher internal pressure. Dont expect no where near as much (if any really) in that can on your truck. And IF you do have any then you know you have internal piston ring wear.
You are right there. I do like the thought of not polluting my intake stream with hot engine gases and keeping the throttle body clean! That is mainly why I like putting these on my vehicles.
