Hey I'm looking at buying a nitrous kit from a guy in town. It was on his supra. Its the universal 4-6 cyl kit. Just wondering if it will work on my 99 cobra. He said it will and so does my brother. Also whats the difference between the 4-6 cyl kit and the v8 kit? Will I need to get a custom dyno tune if it's just a 75 shot? And for the mounting hardware would a local hardware store be fine or can I order it online?