here it is, class winnign car as well,
http://www.scoobynet.com/track-days-and-national-events-25/855072-birkett-6-hour-endurance-silverstone-30th-oct.html
doubtfull you'll max the injectors on a vf28 so i wouldn't worry about it.
my 28 needs replacing before its mapped, seals are going and now and again it kicks out odd blue smoke.