I have an 07 ec300 and run the cck needle and find it to work very well on the bottom but not as well in the middle or on top when compared to the stock N1EH. The cck needle seems leaner on the bottom making for a more crisp and powerful power delivery but on top it is richer and kills the over rev on my bike. The cck needle completely takes away any transition from bottom to mid range so it makes the bike very easy to ride especially in wet and technical conditions. The stock needle is a lot more fun than the cck when I ride above 1/4 throttle in dry conditions.
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