I just bought a Crx and was wondering about the difference in the hf, dx and si motors, and how do i find out which motor is in it?

 

for the 2nd gens, maybe the first gens too, to the right of the rear hatch it will say HF or Si, DX doesnt have anything.
The engine block will say d15b2? for the dx, d16a6 for the si, and i dont know about the hf.

Si - mpfi, sunroof, 14" rims, rear discs 89+?, heaviest, most hp fastest
HF - mpfi, slowest, rear drums, best fuel economy, lightest, no rightside mirror?
DX = dpfi, 13" steelies, rear drums,