Since the fenders are the same for C4S and the GT2, I'm guessing the wheel exchange will not require any modifications, though I suspect the height of a 315/30-18 - 235/40-18 set (my C4S is 295/30-18 - 225/40-18) will cause a slight speedometer bias.
Has anyone done this? Or used the GT2 size and offset for a 2S/4S?
Thanks

 

GT2 rear fenders are rolled, but if your car hasnt been lowered, it may not require it done. If your car is lowered, it may or may not need to be done.

 

Thanks:
I have the Euro front springs and struts, and the US rear springs and shocks, for what I consider to be the best compromise between sport and comfort. Since the rear is way high for a GT2, I suspect I will not need to roll the fenders, but I'll be sure to check after install.
Actually, this is great news; I always thought the wheel wells needed to be filled a little bit more on the 996 C4S/Turbo.

 

I have row C4S springs F&R and the rears still arent as low as the GT2 looks to be.
But the filling of the fender isnt the problem with a 12 in wheel, they may scrape the fender lip when compressed all the way. They had to have a reason that they rolled the GT2 fender.

 

Yes:
I will call my body shop and arrange to have the fenders rolled prior to GT2 tire/wheel installation, just to be safe.
Thanks again for the heads-up.