So after researching on the forum, I've seen a lot of different answers to whether or not it's a direct replacement to the stock T25. Oil restrictors, clocking the turbo, reroute the IC piping, sock WGA's, etc. I'm not completely sure if I'm even going to get a GT28RS or not yet, but if it's a direct swap, it will definitely be more appealing to me. I'm also pretty sure that my stock turbo is dying, and if I have to replace the turbo, I may as well upgrade at the same time. I am also running stock internals, so any input from anybody running a T28RS on stock internals would be appreciated.