Mick, firstly my learning of NADS has come primarily from reading on this forum and the valued one on one advice provided from select members.
Note bigguwesty comment re: either type being contenders and check them out.
Dawes can be acquired from Mudski and he can be contacted via the forum. I installed both the Dawes and needle valve from Mudski and achieved a good result. Certainly would have compared both types if I had knowledge of the 2 options available when I was getting the bits together. Have a read:
http://www.nissanpatrol.com.au/forum...sing-thru-NADS
Understand the EGR block causes the fault code coming up and maybe its placement may also have an effect on their occurrence as well of the driving environments city/rural.
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