Mine is getting the 3L treatment. Its my daily driver and having been in a few VL/R31's even the SOHC 3L feels much less doughy at low rpm than the 2.5L. Cost wise i was originally going to build up my RB25, but for the ~1-2k extra you pay for the 3L (machining/modification of the R33 head to fit, external oil feed and so on) everything else i have done to the engine i would have done to the RB25 anyway.