I want to say something that hasnt been said yet. Nitrous is only a burst of power. First the X's engine will never be able to utilize a Nitrous boost kit without floating a valve and or blowing a gasket. Nitrous isnt a continous boost like a turbo or supercharger is. Someone using Nitrous on their rig is going to burn out the engine because of the weight the engine is pulling first of all and the actual weight of the tires. You guys are looking for a quick boost in power at the push of a button. Quick being around 5 seconds of boost. To a redline street race this is a LONG time. But driving on the highway its not likely to do anything for you. Youd be better off getting an exhaust, new headers, new intake, camshaft replacements, charged ECU, and smaller tires. That right there should give you 15-20 horses ALL THE TIME. And be less exhaustive on your engines life.

Oh and if you really were thinking of racing your X on a drag strip. Go ahead and sell it for a hyundai...I hear those are really fast cars.