Yeah I still cant find a clean answer to do with this illegal moficiation thingo. Every P plater in Qld runs a modified catback exhuast or cannon, yet I hear of no one being fined for it. I have a catback exhaust and a CAI, which technically is a mod as well. But honestly you could change the oil to something not recommended by the car owners manual and gain 1 KW off it and that would be illegal. All I can really tell is that you are no sposed to drive cars with more that 200KW at the flywheel, cars with more than 8 cylinders or car with super/turbochargers. I think the rules are in place to keep people under the 200Kws, so if you got a VS commodore thats 147Kw at the engine when its new, you probably lose at least 30Kw coz its like 13 years old (if not more) so what difference does having a CAI or an exhaust make? Next to nothing on Kw gain. But plently of people get high lift rockers and cams because you cant tell whether people have them or not, especially if your a general cop who knows next to nothing about cars. Unless they impound your car on suspicion and then get someone with mech knowledge to look at it. Thats my thoughts and clarification would be great. Also someone said you cant modify on your red Ps but you can on your Greens? There is no difference between P1 and P2 except you can carry more than one person under the age of 21 after 11pm at night.