To say nitrous is the best bang for the buck is debateable. The mods that you need to do to the engine to accomodate any significant shot of nitrous are extreme. If you don't beef up the engine and just add nitrous you run the risk of burning a piston. Really give it some thought before you do it. It could be REALLY expensive! Of all the things I did to my car before the complete tear down and performance rebuild, the one I noticed the most was an intake with a K&N cone filter.