There are even different versions of the very own N/A SR20DE motor. Highport which you can find in the B13 sentras and NX2k's. There is also the lowport which you find in the 1994 Sentra Se-R, Nissan 200sx se-r, Nissan Sentra SE-L and infiniti G20. People claim there is a slight higher HP differece between the lowport and highport because of the intake manifold design and emissions restrictions.

The 98+ Nissan Sentra SE-L, newer infiniti G20's and the 00-01 Nissan sentra SE all share the Roller rocker motors which are not the strongest SR20 motor between them all.

You can also find the UK 10.1 compression motor which it claims to have 150 HP but they are a little harder to find.