Well I don’t have a Mustang but I do have a 1998 Grand Marquis with a 4.6. I wanted to boost its power for those special occasions but still have a dependable daily driver. I am told that NOS gives the most horsepower for the least amount of money with few engine modifications. For those of you that have some knowledge about nitrous oxide could you tell me about how long a bottle would last? Is it true that you only get a few seconds of boost per bottle? Are refills costly? The thought of a granny car sleeper intrigues me. Thanks!