Viper has 3 trains, and one is smoother than the other 2. I think it is the one with the gold stripe. (the others are red and orange)
General advise: If a coaster has OSTR's with grab bars and the signs read "Keep hands on grab bars, keep head against headrest," Do it! It works! Just forget about raising your hands and there is a whole world of woderful rides out there!
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"X" marks the spot in 2001!