It'd probably be easier to just look at the block code. On the passenger side of the engine, just below where the head and block meet, is a small plate with the block code on it. If it's dirty, get a squirt bottle and a toothbrush and clean if off and read it. Stock Si engine was the D16Z6. If it starts with a B, then that's cool for you. If it's anything else but D16Y8, that's not cool. Period.