Would like to fit a 245/35/18 on my 08' si sedan, is this possible? What type of offset will be required. A 18X8 wheel is probably what I think would be the most appropriate.

Tire rack says no, but I think they are being conservative.

I have the HFP sport suspension. And too all who are wondering, I put the springs side by side and they were 3/4" lower fronts and rears. Then I measured a part of the frame before and after the installation and it was 6 3/4" before and 6" when I was done.

The ride is almost as comfortable and does not hit hard like coil over kits, I also bought the eibach sway bar kit. This is an awsome combo. Still leaves a bit of wheel well gap, but as far as road holding it's pretty damn good.

But will those wheel and tire size fit?