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No the NADs is not needed for the CRD. The dawes will give you a smoother boost curve and the needle valve will allow you to control the spool up rate of the turbo. At all. But its needed if you want any performance gains. Thats for sure. Bigger pipe. Some say 2 3/4inch, some say 3inch. I personally think 3inch. Performance chip, egr blocked. Modified intake pipe, tricked maf housing to allow higher boost levels.
Last edited by mudski; 17th April 2016 at 12:08 AM.