Well I must say, I was not impressed. I have an 03 viper, 1600 miles on it, 144 woodys, and MBRP trail can, other than that stock. A friend of mine has an 05 ski doo rev 500ss, no studs, and a dyno port can, other than that stock. Due to the icy conditions on the lake, we took off side by side until about 40 MPH, and then both WOT, and I could not beleive it. The 500ss was dead even with me across the lake. I was reading 104 on the dream meter, and he was only one half of a sled length behind mine. Any way had to post it, I was not impressed with the viper this time.