If you really wanted to build your own kit there is a WEALTH of information available on installing it. Its really not difficult at all. Hell, you could probably buy someones complete kit thats being sold for less then you will spend on the greddy or drag kit. If you simply must get a prebuilt kit, then i would suggest the PeakBoost kit. It is in my opinion the BEST kit you can buy and offers everything you need to get boosted.
here is a link to the peak boost kit so you can see just how impressive it is
http://www.kteller.com/store/product...oducts_id/1539