I hope I'm not one of those guys that posts a question a few days after it has been discussed to death but what is a Gen 3 SRF?
See the bottom of the results:
http://scca.cdn.racersites.com/prod/...unRace-GP4.pdf
I heard it on Sunday but was too tired/lazy to walk over to the track to see what sounded so different from the rest of the SRFs.