SI's are over played, because you can find them everywhere so almost everyone goes with the si head over the gsr head, ... i have a buddy in a 2000 4 dr civic dx, with a b20 vtec, and he decided to go with the gsr head, he's neck and neck with the srt-4 and has no traction,,, it depend on what you want really,
but if you want somethings thats going to last-be reliable and be faster, go GSR
