We don't have yearly inspections, however we do need to display P plates (probationary license) therefore making us the epitomy of ordinariness in the driving community (according the law, statistics and well everyone else...) thus making all p plate cars absolute cop magnets.
Coppers are checking cars more closely and having massive crackdowns throughout Aus, especially Melbourne and Sydney.
If we're caught with a modded engine, then it's an instant defect and big fines for the driver, then it's back to square one, the little old A12! Then all of that work building an A14/15 is money down the drain as you'll never get it back trying to onsell it...(don't quote me on those laws either...)