[masraum]

I have an '88 that came from the PO with a front spoiler and no rear. My understanding from reading Paul Frere's book "Porsche 911 Story" is that having either without the other results in actually increasing lift at the end without a spoiler. So techinically having my front without the rear results in more lift on the rear axle at speed which makes the car more susceptible to oversteer at high speeds. Not a pleasant thought. The front spoiler keeps air out from under the car and Porsche found that by extending the front spoiler lowere towards the ground it decreased lift and eventually actually made downforce, but it increased lift over the rear so they compromised. I believe the front spoiler will be more effective when I get my car lowered from US height putting the spoiler lower to the ground. It also can't help the US height cars actually have the rearend jacked up more than the front.

All of that being said I have had my car into the 120-130 range quite a few times (in a straight line) with no problems. I have also had the car at 145 with the targa top off ( and LOUD) again a straight line with no problems. And have also had the car at redline in 5th ~150 with an S2000 right behind me. It does feel a little light above 140, but it's not that scary, of course the times that I was at top speed I was running down a highway with tall trees on either side that probably kept most of the winds and cross winds to a minimum. In Houston I run 70-95 almost daily with no problems at all. I want a tail and can't wait to get one, but money is an issue right now, so I am forced to wait.
I wouldn't want a rear without the front. I have mental images of the LMP/GTP cars that have gone airborn. I doubt a 911 would, but I'm thinking at high speeds things could get messy with only the rear and all of that lift on the front.