Those speedo top speeds seem low ? I have a 03 stretched to 136" and geared down to 40T like a warrior with HH's up front and advant-edge roller in the back and was able to get 118 mph on the speedo on the river with probably 6"-8" of snow flattened down by sleds that I would consider loose and not very fast snow (Jaymor would you agree ?) I ran yesterday on Lee River and it was very loose snow and got about 110 mph on the speedo but got there a lot faster than I used to now running the ECP kit. I think Fred will agree top speed will not improve dramatically but what I noticed was getting there a lot quicker and one thing very apparent was how quickly I can now accelerate in deep snow !! My buddies on REV's would destroy me in about 6" of fresh snow with stock RX-1 airbox but now with the K&N's I accelerate much harder in the snow and appear to get better top speed in the snow as well. After putting on a couple of hundred miles I am very impressed with the improvement and apparently NO negatives at all in all areas (deep snow, hard pack, wide open, tight trails on off the gas) I would say the ECP kit provides the best "Price Performance" of any mods I have ever done ! Gas mileage seemed very comparable to stock air box but have not crunched the numbers yet, definately does not seem to use a lot more gas !