I think I figured it out...I copiedd this from an article I just found on the web. If i have different weight wheels on the rears with different off sets would that lead to my handling problem? I believe so...I have one one Tequipment Technology wheel and the then a Turbo Look wheel. Different weights and different off sets. See below:

The Porsche Tequipment® Technology wheels first appeared on the 993 Turbo, and soon thereafter became famous for their light-weight, hollow spoke design. Porsche says of the Technology wheel and tire set, "Hollow aluminum alloy spokes are inseparably fused to the rim using a patented friction welding process, resulting in a weight reduction of 25% over conventional wheels. High-performance tires add unshakable confidence for pouring power onto pavement." I say let 'er rip!

Additional pictures can be seen here.

Since the introduction of the true Technology wheel, Porsche has also introduced a "Turbo Look" version (option M413) with solid spokes for the both the 911 and the Boxster. There seems to be considerable confusion in the marketplace (e.g., eBay ads) regarding these two different wheels since many owners of the solid spoke versions describe them as "Technology wheels." Only the hollow spoke versions are true Technology wheels (option M408).

Several differences distinguish the Technology wheels from their turbo look counterparts: Technology wheel sets have metal valve stems.

Technology wheel spokes are smooth on the back side and Turbo Look wheel spokes are ribbed.
Technology wheels weigh a lot less: 7.5" fronts are 20.3 vs. 25.1 lb and 10" rears are 24.2 vs. 29.4 lb.


The following table outlines the available wheels for both narrow and wide body cars. When purchasing wheels in the used marketplace... "if the part number doesn't fit, don't commit!" Any problems, just talk to my lawyer... Johnny C.

Hollow & Solid Spoke Wheels — Parts List

Fitment
Size
Offset
Hollow Spoke
Option M408
Solid Spoke
Option M413

Front 7.5 x 18 50 mm 993-362-134-05
993-362-134-06
Front 8.0 x 18 52 mm 993-362-136-00
993-362-136-01
Rear 9.0 x 18 52 mm 993-362-138-00 993-362-138-01
Rear 10.0 x 18 65 mm 993-362-140-01 993-362-140-04
Rear 10.0 x 18 40 mm 993-362-140-00 993-362-140-03

 

After driving my Audi all winter, I noticed that the Porsche 996 seem to be floating.

I just put on new continentals, alignment, control arm. I also have a GT three front bumper and a twin turbo rear. New Bilstien sport shocks.

Unfortunately, the car still floats, especially around 80 mph or so. It feels like I'm constantly making micro corrections to keep it going straight.

Is this Porsche really supposed to feel like this?

 

*edit* Toned down due to extreme dickishness.

Please take the car to a Porsche shop that your local PCA members use for track setups. They will be able to evaluate your setup for correct aero as well as dial in an alignment that works properly.

 

My Continental DW tires really like to grab and pull at the road. Not to an annoying extent, but they do require extra attention.

To 5CHN3LL's point 2 - I have no idea, in 2015, why there isn't programming in place for threads inactive for over a year that will ask you "do you really want to bump an old thread" and requires a yes or no. [edit] Or just a warning or a bigger date on some posts. Or maybe when quoting a old post the warning coming up.

 

Thank you for searching before posting, really helps reduce unessesary cluter & makes future searches more productive!

Just because a vehicle is aligned does not mean it is done correctly. Only way to document what was done is to get a before & after printout of the front & rear settings. Your front & rear bumper covers may be causing the "floating" too.