I went once with the standard a15 and once with the CA - needs a 4.1 diff as the gearing is too long was still hooking 130km on short straight.
You usually go out for around 5 lap intervals with usually ten cars spread around the whole track makes for good fun trying to catch and pass - and what an awesome event to go to and you'll be pissing on the HONDAAAAs
if not im gearing up for the playday on track event in feb/march