additional weight (several hundred pounds)
poor weight distribution for drag racing (things like the battery in the back seat, aluminum hood, aluminum control arms and aluminum front bumper all work to reduce the percentage of weight on the front tires, resulting in less traction during acceleration)
larger front brakes (more rotating mass reduces power put to the ground)
larger tires and wheels (increased rotating mass takes more power to accelerate)
restrictive PCM (much more aggressive traction control system cannot be overridden by simply pulling a fuse; PCM will actually retard ignition timing if you try to power-brake the car)
no Performance Shift function (so shift points are lower and shifts are slower)
no air opening behind the headlight means that removing the headlight won’t give you any cold air
The Regal GS is slightly (a couple tenths) slower than a similarly equipped GTP, for some of the same reasons as the SSEi.
This is interesting. It'* obviously written about a 00 or newer, considering the location of the battery quoted.
In comparison my 93 SSEi:
My battery is in under the hood. My hood is steel, fenders plastic, but all the suspension is steel as well.
I only have 10" rotors, so my rotating mass is lower than a stock GTP.
My wheels are only 16". Not a problem with mass there, either.
Non-restrictive PCM (ok, I cheat. I have Jet Stage 2), and my traction can be disabled, but it never retarded timing, anyway. Uses applied braking when it'* on.
Not only do I have performance shift, but the Jet raised my shiftpoints.
I have large openings behind my headlight. 2 large 3" diameter holes, to be specific.