The racing is very close and aggressive between all the V8 Championship Series teams, with usually less than a second separating the top 25 cars. Teams design and construct their own cars and engines (Some teams opt to buy engines from stronger teams, e.g. SBR, 888, BJR and PCR use SBR developed Ford V8's, while HRT, HSVDT and Perkins Engineering use HMS developed Holden V8's while the rest of the Holden teams use their own developed Holden V8's) leading to minor/major (depending on teams) engineering differences among teams despite the cars being the same make.