Tried it in our SE, no steady idle, loss of power on the Dyno in our case. Engine leaned out big time and started to back fire under deceleration. Needless to say, it came right back out.
Observations: Seat of the pants thought it was better, but that was because the low end suffered, so of course the high felt better. However, as previously mentioned, the dyno numbers proved otherwise. No gains in HP or torque. This may also be because of OBD 1 in our 95 SE.
Dyno numbers
Stock MAF 167hp, 164lbsft (at the wheels)
Postless MAF 160hp, 152lbsft (at the wheels)
Just my 2 cents. Some have noted that they felt gains. We didn't see any.