Its not really so much about the power difference as I am well aware that the 2009+ wrx is faster in a straight line than an STi, but I am more interested in the 6 speed transmission. I would like to be able to push harder on my tranny without fear of it breaking. And while yes I understand that there is a general agreement that if you know what your doing it won't break, but I'd like the added assurance of the 6 speed that I know is there for sure.
Everyone seems to have a lot of ambiguity as to what the wrx tranny can actually withstand. I guess I'd rather not find out. I tried to find information about doing a tranny swap for the 09 wrx, but I haven't really found anything.
I think the biggest concern, after all my thinking about this, is really just comes down to the transmission. I know the motor can be pushed farther, I know that I can upgrade the suspension. But what I can't really do is change the transmission. It hasn't really been done with the 09 wrx that I know of, and I don't even know if its worth the money, it seems like I could just trade in for an 08+ STI. Or even better, there's an 06 sti for sale for 25k. I could just trade in for that and not really lose anything.