Originally Posted by longfellow2

91 dohc exhaust cam is more agressive than any other year, so people used to put two exhuast cams in the car for a little more power. This was done because there were no aftermarket camshafts for these motors at the time.

IIRC the S14 KA motors had the least agressive cams.

Its really hard to find them, and its not that much of a gain unless you really know what your doing.

FYI most motor companys change small things like cam profiles, compression, ecu's ect ect ever few years even on the same motor. Just becasue its the same motor dosnt mean they are carbon copies of eachother.