Post what you know! My thought: 1. Differences of Ibishu 2.0L Engine (200bx and 2nd gen pessima) max rpm The 200bx 2.0L engine has a lower max rpm and the 2nd gen Pessima has a higher one (for performance Long Block). If you look at the engine 3d model, you can see the different shapes of the head cover etc. It could be simply because the pessima engine is a short stroke type and the 200bx is a long stroke type, or possibly because the cylinder head has a different valve system. Incidentally, the Nissan SR20 engine cylinder head has a DE version with rocker arms that are said to be fragile and unable to rev to high rpm, and a heavy duty VE version with a system similar to VTEC. 200bx and 2nd gen pessima may also have such a version.