When i was sent to mcleod, i was in my old car: Onevia RB20DET, hks2540R, 440cc injectors, full exhaust, dr drift remap etc...
I passed, they checked for BOV, Boost Controller, they did check for aftermarket ecu but they only pulled the plastic cover of they did not pull the computer to bits to check for chip etc...
They did check for aftermarket turbo, but as mine was still lowmounted and had all stock heatsheild on it they passed me...
And they also check for engineers cert if you have engine swap etc...