You have to go through a lot of nitrous to spend more on it than a $4500 turbo setup. I can't imagine keeping the nitrous on that much. For $1000 you can have one hell of a nice nitrous system. Buy your own nitrous refill bottles and fill your own for less than $2 a pound, depending upon the state. Getting 100hp from a turbo setup is about maximum gains on a 4.8 but you can use it any time and your bottle never runs empty. The turbo can gain you mpg if done right and the boost is always available. Nitrous is an off and on setup and you only use the gas when you tell it to. Nitrous is consumed at a rate of about 1 lb of gas for every 10 seconds of a 100 HP boost.