The wording of the RTA.ACT site is Crap and very misleading.
Modified cars, will mean cars that are required to have an engineering cert, Spetz as you found your lancer falls into that catagory.
there are two types of modifications
Basic/Minor/Common mods - ala exhausts, wheels etc etc (not including turbo upgrades) can be done at any approved inspection station
and
Extensive/Significant mods - ala engine swaps, brake upgrades etc etc that require an engineering cert will need to go through Dickson
My advise, make EVERYTHING look as standard/Factory as possible, if possible
Edit - See here
http://www.rego.act.gov.au/assets/PDFs/Light%20Vehicle%20Modifications%20in%20the%20ACT.pdf
and here
http://www.infrastructure.gov.au/roads/vehicle_regulation/bulletin/vsb_ncop.aspx