I am building an all out engine, and so have several others. I know that the VAC car that finished 7th was with an all out built motor and chassis. Irish Mike was using his acutal World Challenge car. So, your insinuation that there are no fully built N/A cars is patently false. It's also false that a turbo car would be any less expensive build than a N/A build, it requires an additonal highly engineered part that stresses all other parts around it.