Whakaotihia te rerenga e whai ake nei: I te tau 2003 i hangaia e GRM tetahi motuka tuarua mo te taraiwa motuka haerenga rongonui a Peter Brock ka tiimata i te rauna 2 o te whakataetae i Symmons Plains i Tasmania. I eke a Brock i te Monaro toa Bathurst i nga whakataetae tautoko o te Nations Cup i te
2003 Australian Grand Prix i Melbourne i mua i te tīmatanga o te toa i etahi wiki i muri mai i Adelaide. I Melbourne i rere te motuka me te # 05 rongonui a Brock kaua ki tana # 427 noa, i wikitoria i nga whakataetae e wha i muri i tana pakanga ki te Lamborghini Diablo o Paul Stokell, ahakoa i whakaae a Brock kaore ia i wikitoria i tetahi o aua whakataetae mena kaore a Stokell i raru i ia whakataetae. Katahi ia ka taraiwa i te motuka hou, i peita whero, tae noa ki te mutunga o te raupapa, me te kore tautoko a nga roopu Monaro o Just Car Insurance (ko te kaitautoko nui o te GRM i roto i nga V8 Supercars ko Valvoline), i roto i te Nations Cup Championship i te taha o Pretty, ahakoa kaore ia i wikitoria i tetahi whakataetae Nations cup tae noa ki te whakataetae whakatuwheratanga o te rauna whakamutunga i Surfers Paradise. Ko Pretty raua ko Brock te tuatoru me te tuawha i te whakataetae 2003.