I don't blame you if you'd rather not check the scion.com website... it SUCKS! >_<

 

If you're wanting the Yokohamas over the Bridgestones purely for replacement cost considerations, don't worry either way. Either tire (the Yoko S320s or the Bridgestone Potenza RE92s) are north of $175 a tire to replace.

My '06 came with the Yokohamas, but considering I work for Bridgestone/Firestone, those didn't last long. My free set of Potenza S-03 Pole Positions were on in 3 days.