Everyone is looking for that ECU ... especially for manual. 95% of the cars that came with the d15b (3 stage OBD2) were CVTs = manual ECU is ULTRA RARE.
3 stage vtec works like this
0-2500 rpm - you are using only half of your intake valves (12 valves active) - GOOD Economy
2500 - 5500 rpm - you are running regular non vtec timing (all 16 valves active)
5500 - redline - high profile (one of if not the most aggressive timing on a stock d-series cam)
JDM Engine Depot has auto P2Js, I am pretty sure the pinouts are VERY simmilar if not identical, problem is that the maps are a bit different for an auto, and you will not have vtec engaged unless you trick the ecu into thinking it is in D.
result: ~130 horses, 102 f-lb tourque
more power than a d16y7 and 1 less f-lb of tourque
pretty much almost twice the fuel econ if you are not beating
theory suggests that going constant ~45mph with optimal tranmission gearing yields 70 mpg which translates to like 40 to 50 mpg during regular driving. TAKE THAT, PRIUS!!!
If you find one, let me know, I am trying to do this swap in my 2000 civic (stock d16y7 engine)