When I spoke to the WA version of RTA re my planned car mods they told me that the Subaru L's are NOT considered to be 4WD's they are categorised as a 'Passenger' vehicle. Same as those Toymotor 'TERCELs'....
Most states would come down to the similar basic rule of 'power to weight' ratio. This was also explained to me by an auto engineer here in Perth. As some have also said earlier, it can also be subject to some other factors, such as age of the vehicle and what you are doing to it AND what the car came out with from the factory. But if they can 'OK' my EJ25 into my 85 L then you shouldnt have too much trouble. From memory my 2.5L just scraped in, in regards to power increase over the std EA taking into consideration the car's std unladen weight. I put the entire rebuild past this engineer guy prior to doing anything, who said its all fine. All I have to do when complete, is supply a comprehensive list of all the modifications to him and then book the car in with him for a few days to perform steering & braking tests using his fancy diagnostic gear. Also cos I stuck to all Subaru parts and componants it should make my mods easier to certify than say custom modded parts or non subaru parts as they've already passed ADR standards.
But you intend to get your car fully engineered Ben, I would recommend you put your custom 2" lift in AFTER its certified. Cos the lift can alter the car's steering geometry and brake performances in a test and coz the 2" lift does not require an eng cert within Oz they cant knock you back after the jobs done. Also, coz your lift will be 'home made' it MAY possibly make it a lil harder to 'engineer' than say a pretested 'scorpion kit' for eg. But thats just my 2 cents worth.
Regards
L-Raiser
