get the Zo6 and use the extra 15k u saved, from the viper and mod the zo6, so in all there is no comparison, unless it was a Z06 with 15k in mods vs. a stock viper, in which the z06 would kick the viper outa the picture...but then u can also put all that money into a down payment for a house, get a 5k 5.0 mustang , biuld that up and compete with the vipers and zo6....