The difference is the manifold. The manifold for the gsr and b16 are different. In order to make it fit, it is easier to find a b16 manifold. There should be some additional brackets and hosing you will still need from jackson. The blowers are both the same because they both are m62 blowers. Try ebay for the manifold, for i have seen two before there, but, that was a while ago. try
www.hostboard.com, because there are alot of jrsc guys there who are getting in and out of the game.The manifold itself from jackson is $218 without the fittings. You may also need the bypass valve assembly which will run you an additional $200. The entire manifold setup is $543. Remember, you still need all the brackets, nuts, bolts, and corresponding hoses which will cost extra.
[whispers] id rather just buy a kit that is made for my specific car [whispers]
Just curious, how much are you buying the JRSC for?