Just put a GT3 bar on my 2008 base 987. The car has 18" wheels, PASM and 5mm spacers. It is now a truly awesome handling car. As neutral as any car I have ever driven yet not nervous at all. Seems like the bar on the softest setting both tames understeer and plants the rear. The ride is only slightly rougher over bumps that only one side of the car goes over. This is my all-time favorite car mod. Can't wait to get it on an autox course.
The install is a ******************** as unlike the 986 the front subframe must be lowered to get the bar in. Needs to be done on a lift IMHO.