I have one of these too and have the slowest one (400) on my bike right now. It makes the bike feel a little doggy at first and then you get used to it. Sometimes I can tell that it helps me maintain control, like when trying to avoid wheelspin during hillclimbs. I think if you run the 400 in the woods and for MX tracks you switch to the 100 (equivalent to stock) it'll feel like the engine is much more responsive until your body gets used to it again. They make a "pro" version that opens faster than stock for the 4 strokes but not for 2 strokes, at least not that they advertise.
Jon
'01 XC300
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