the autos are within .1-.4 seconds of teh 5spd in the 1/4 mile.
and yes it is possible since those dyno runs are done with all different ages of engines on different days in different states of tune.
you really cant compare dyno sheets unles you are doing the cars at least on teh same dyno with teh same settings on the dyno.
you will see the same variation on all engines though.

my 92/93 h22a put down 176 hp and 152 ft/lbs with high miles egr system not working, wiwth an intake and exhaust only.