i got the 2003 non supercharged and i am completely happy. as you might know, nissan added 10hp this year, and that does make the car less sluggish. personally, i dont see the point of spending so much money for something you will hardly need. i dont think the car is sluggish, however it is an SUV. i wouldnt expect to break records, but it isnt underpowered. and even if you want a few more HP's, you can drope a high speed filter in the car for $50, or upgrade to the nissan certified sport muffler for $400, and still be under the budget of the supper charger, and have better gas milage and use regular gas.