From looking at pictures it seems the engine in the new viper is at least 2" higher than the nitro in relation to the drive shaft. Maybe it doesn't make any difference. Maybe the chassis is so much better that it will handle great with the engine being higher, I don't know. I would expect the sled to handle better with the engine lower. I would like to ride this sled back to back with a procross 800 and 1100 turbo that would tell me a lot. Just thinking out loud and asking questions.