Which is nonetheless impressive. The secret was indeed a combination of many things, among incredible balancing, cams, and head redesign. I have a friend who imported an E30 M3 Race Car from Italy. The thing is beautiful. Driveability?? None!! If the revs drop below 4000rpm, the car will stall. Just not driveable! The most HP I would feel is realistic for an E30 M3 Street car with a 2.5 would be in the 270-280 crank hp neighborhood. And still maintaining decent drivability characteristics. Cheers