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Projects for 2009?

From what I can see the reason for the understeer is that I have wheels for a C2 and I have a C4, so the rear wheels are 255's and the fronts are 205's.
I have checked to see if 225's will fit the front and they do so come the spring I will be changing these (they only have around 3-4mm of tread left and need replacing.

How does the 21mm ARB work (i'm not technically minded when it comes to cars, I know the basics but not the in's and out's))?
 
AFAIK the tyre sizes you quote for 17s are exactly the same regardless of being fitted on a C2 or C4 i.e. 205 on the front is what Porsche recommend although many will put on a 225 to reduce understeer on a C4.

Regarding the effect of changing the rear ARB on a C4, have a read of these articles to find out more:

Wringing out understeer on a C4
 
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