not sure how the external filter works, but will look into it. Got a new turbo from the dealership under warranty, and would like to keep it clean. If it helps, ill look into it. By the way, the doesnt the butteryfly only control how much EGR goes into the engine.

 

i would just delete the butterfly mine gave me probs a little while after the deletes and made it hell to figure out what it was cause it was making an extremely wierd noise i i do ihave a thread on here called crank case filter delete just so u know