2010 EC300 Race/Euro (same engine config as 2011s). 38mm PWK ASII.
I have found the NEDJ/N3EJ both to work well in the same clip positions. (2 or 1) depending on season. As stated the NExx is much smoother off the bottom (lacks some snap), and richer towards WOT (requires smaller main). The N3xx is more agressive.
Both offer alternate needles for half clip adjustments. NECJ/N3CJ.
I like to pair them with a 40 pilot, and 172 (NExx) or 175/178 (N3xx).
My experiences with the N1EF stock needle was that it was well rich in the lower openings and I also had to run it at a high clip position which seems to be normal for my conditions. I'm sure if you got hold of a N1EJ or NOZJ there could be some good results there too.
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