lets do some math, RB20 is a inline 6 w/ same displacement as SR20 with less TQ. Now in the post above yours told by Chin180sx (me) I say RB25 is crap, which puts out I believe about 40-50 more hp than RB20, what would give you the idea that a RB20 is better than an RB25, which has already been established to be worst than SR20DET. Its like having the wheel, but using a square wheel instead.