So who knows what the differences between the 90-91 and the 92-93 B18a1 are? I noticed that peak torque is the same (but comes at a lower RPM), but peak HP is different - 130 vs 140?

*edit - the only info I could find indicated different cams with higher lift and longer duration on the 92-93 cams. If you were going to swap cams though, aftermarket is definitely going to give you more of everything. Other than the fact that stock cams might be cheaper, I don't see why anyone wouldn't just go aftermarket.