I touched on the S60 that Volvo is racing with Earlier, but in essence it is the same engine that is in the XC90. Also, coincidentally it is in the Noble M600, the modern day equivalent to the greatest road going car ever, the Ferrari F40. Funny to think the engine that powers this amazing car
comes from this.
Gives me a few ideas for an engine swap if I could ever afford to. Below is a link that details exactly what they are racing with.
BTW, in the link there was this picture posted in the comments. I thought it fitting.