Top tens seem a little overly optimistic to me, too.
Think about the competition.
Stu Hayner and the GMAC Pontiac GTO.
Tommy Archer and Bob Woodhouse in Viper Competition Coupes.
Leighton Reese in a C6 Corvette.
Andy Pilgrim, Max Angelelli, and Mad Max Papis in Cadillac CTS-V's.
Phil McClure and David Farmer in Z06 Vettes.
Derek Bell and the factory Volvo S60-R.
That's ten cars right there and that's not including the plethora of Porsche 911's, Vettes, BMW M3's, and so on that will undoubtedly contest this season. GT is ridiculously competitive and there are several more cars on deck for this season that'll be showing up; the new generation of 911's, new Mustangs, more C6 Corvettes, and so on down the list.
If AF can get the R34 into striking distance of the top tier (hence, top fifteen), then it'll be a major accomplishment as a first-year team.