Speedo gives you track speed, GPS gives you actual movement speed get that thing to hook up and youll see your speedo readings come closer to GPS readings. On hard pack, 32F, stock jetting, 144 woodys I lined up (viper) with 2-SRXs, 1-EDGE, 1- piped & clutched ZR700, 3- ZR800s, 1- clutched ZRT600 and an MXZ 800 I pulled every sled there out of the hole at 96mph the 2 srxs reeled me in at 120mph my viper had no more legs the only other sled that was close was the MXZ at 3-4 sled lengths. For a sled built to tear up the trails the single pipe triple definetly holds its own on the lake. In the twisties the viper is amazing, I consistently ride with the ZR800s they are good but they dont handle as well as the viper. We are not weekend warriors we all ride hard and are very capable riders. In my opinion anyone that bought a viper bought one #### of a great sled, you can pound it, run it, flat out abuse it and it will keep coming. The faster you ride it in the rough stuff the better it performs.