Negative effects of a narrower rear wheel?

[997C2SCab]

I am looking for some technical advice about wheel size. I have an 2006 C2S Cab and I am looking to put some 20 inch aftermarket wheels on it. I found some affordable wheels I really dig but the widest they come in are 10.5 inches (not in 11 inches like the factory rims). I actually prefer the look of the tire on the narrower rim than I do on the 11 inch. FWIW - Below are pics of my car and of the wheels I like.

Is there any techinical reasons why I should not go with a slightly narrower rim if the offset and all othe aspects of the wheel are correct for my car?

Thanks in advance. B)

Edited February 8, 2008 by 997C2SCab

[ashleyisagirlsname]

I've seen those 20's around, who makes them and where do you get them?

[997C2SCab]

I've seen those 20's around, who makes them and where do you get them?

They are a Vossen 094s. Wheel Dynamics sells them. They sell a bunch of other cheap (and fugly) wheels for porsche but it seems that most of what they sell is designed for 996s an not so much for 997s.