I bought the Harris Speed Works Sudden Impact Kit, it comes with everything you need, including a great installation guide. Matt, the representative from HSW, has been very helpful in everything question i have had, and so far, the one problem i have had. Nitrous is like a swift kick in the ass and i see why they call it giggle juice. I havent even gone past the 75 shot yet, which is the smallest jet, and it still feels amazing. I highly recommend this kit to whomever buys it.