Matt, I was thinking aboot the same thing for the 1j. I'm comtemplating having a custom T3 mani made and doing something in the order of twin GT-RS' (Which kinda falls in the lines of what Got_boosted was saying with the whole Skyline/RB26 thing). I haven't put very much thought and research into it yet though. After talking with Tim the other day, he pointed out to what drawbacks to having a bolt-on upgraded twins would be-both on the 1j-and on the 2j-and that was that the manifolds were really restrictive. Though is probably is more cost-effective anyway to have a manifold made, and buy 2 GT-RS' than have the stockers upgraded anyway. HKS makes a kit for the 2j, but it will cost you your left nut and several children.