For jetting changes, I tried the new cover with the stock setup, N1EF-1, 40 175. Not much improvement. I went leaner everywhere, then richer everywhere to get a feel for what the changes would run like, mostly changing the pilot and experimenting with different needles.
I could never get rid of the softening of response with the cover. The bike seemed to make a bit, and I mean a tiny bit more power at the very bottom end. Anything above that it just seemed less crisp. The power was there, but the sharpness was lacking some from the stock cover.
The cover was well made and looked great but it wasn't working for me in my situation. Without the cover I finally settled on a 42, NOZH-1, 160 main. I know the 160 looks lean but with the rich final taper of the NOZx series and the 95+ degree weather it rocks.
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'10 EC300 -- very happy 
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