Got my 18 Inch Turbo Twist Finally
 

After 2 months of having the car with the stock 17 inch twist I finally got my 18 inch Turbo Twist. I love the look but I do not know if there is anything wrong with my installation or not. It seems like steering wheels "shimmies" often. It not like the car vibrates but almost as if every damn rock effects it now. Is this the low profile tires and 18 inch wheels doing this? Thats all that I can tell is wrong/im not used to so far.

pretty nice.
Your car needs skirting to go with 18" wheels.

Shimmy shimy shake huh? were the wheels properly balanced?
Or did you get these previously balanced and driven? (in other words: used)

Try riding with higher tire pressures. It will be bouncier but will take some of the bite out of driving over bumps and cracks/seams in the pavement.
And 17" wheels aren't necessarily easier than than 18" wheels in terms of ride quality. It has more to do with the weight of the tire and wheel combination.
This is why I went with the 18" Carrera light about 10 pounds lighter than your TT's. But like everything else in car upgrade world you will get used to it.

p.s.
I recommend getting those $30 plastic-chrome grill strips sold on Ebay, nice contrast chrome and blue.
http://images.channeladvisor.com/Sel...HE_BOXSTER.JPG
http://cgi.ebay.com/ebaymotors/PORSCHE-BOXSTER-CARRERA-996-986-CHROME-GRILL-GRILLE-KIT_W0QQcmdZViewItemQQcategoryZ33645QQitemZ8023313 551QQrdZ1
or you can get door edge protectors from Pep-boys and cut and measure them your self for $10. A silver hood badge would compliment that nicely.