Here's my experience for what it's worth....Lowering improved the handling of my 911. However, my car was nose high to start with so the difference was probably more than if the car had been the correct hight to start with. I also changed the torsion bars to 22/28 mm. The larger torsion bars probably improved the handling more than the ride hight. The shop (in my opinion) lowered the car too much. I wanted it at Euro. hight but it's about .5" lower. I wouldn't go any lower than euro hight. My front tires are now hitting my fender in some situations. I will have to have the fenders rolled if I keep it at this hight.
The cars I've seen at autocrosses that are U.S. hight handle fine. My opinion...if you're happy with the look of your car, and you're not autocrossing and tracking, don't bother with the ride hight. For me, I spent a lot of $$ on the suspension without much gain. I would be faster on the track if I put the $$ into more driving instruction and less car constuction.
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