well you heard wrong, the si only has a d16z6, same engine as the 92-95 civic si's and civic ex's. It is only 125hp, sohc VTEC. The dohc came in the Del Sol VTEC, which was the b16a3 with 160 hp and 8250 redline. Good luck finding that engine. It is much easier to just buy the b16a sir II from japan and swap that in.