I used the stock pads also with RBF 600 when I went to Daytona last year. Worked well for me also, it was my first track event so I wasn't going for the world record or anything lol.
Just checked my factory filters this past weekend and they are finally at the point where they need changing. Definitely will be getting a set of these filters!
They have the S Type in axle back though and with an h pipe it sounds really good. There are a few videos on youtube for the S550s that have an h pipe with an S Type axleback.