I didn't see an WRX STi listed as competition in those results.
The STi is a beast, we had one at the last auto cross driven by an SCCA Solo National finalist and it was 3 seconds faster than the fastest Boxster S and 1.5 seconds faster than a fully prepped 944S on race tires driven by another national finalist.
That same STi driver took out the stock class 987S winner's car and pretty much matched it's winning time (still 3 seconds slower then the STi).
BTW, the STi was driven from the dealership to the track, it had less than 200 miles on it.
Now, when you figure in the PAX handicap a 986S ended up the class winner and was within .15 seconds (adjusted) of the STi.
If they weren't so butt ugly I might consider one...... Nah, just sooped up rice