Zakspeed Vipers who are racing the 24 H of the Nurburgring are V8's. They had to cut off 2 cylinders. The red Viper in the video is the Viper-jet. Zakspeed – The Motorsport Company
I dont know if you mean actually physically cut off but from my reading it was explained that its still the same V10 just with two cylinders deactivated.....That is the only way the BMW/Porsches could compete with it....I remember hearing about a race at the Ring a few years back where the Zakspeed Viper with its full 10 cylinders at the time was embarrassing the Germans on there own soil....they setup bogus infractions to force it in the pits for stop and go nonsence...Dont rmemeber if it ended up winning that race.....