Greddy turbo is also smaller (I have one).I had a greedy turbo on my b16 i had a lot done to it, and only got 290hp and 240tq out of it. and it was professionally tuned on a dyno. 300-350hp is big numbers..but i like your si, im talking to a buddy of mine that is looking for one. I'll let you know..
*Can you update the pics on your post most aren't working*