You are best looking at, reading and understanding the light vehicle modification rules on the RMS website. They do change from time to time, so our sticky in the modifications forum is often out of date. If you are not able to find them, read them and understand them in relation to the changes you wish to make, then i would suggest that you enlist professional help from the outset rather than rely on the forum for advice. Remember that if you make modifications that are not legal, you will not be insured. Most importantly, suspension modifications mean changes to safety critical items. Do it wrong and you could kill yourself or, worse, someone else.
http://www.rms.nsw.gov.au/roads/safety-rules/vehicle-standards/index.htmlRMS wrote:
Owner-certified modifications
Modifications which add optional equipment to a vehicle can generally be owner-certified.
Non-standard modifications of a minor nature which do not affect the level of safety, strength or reliability of vital systems like brakes and steering, may also be owner-certified.
These modifications have little or no impact on the vehicle’s level of compliance with the Australian Design Rules.
Coilovers were never a factory option, so because that modification is outside the permissible owner certifieable things which are basically fitting other factory optioned items (e.g. disc brakes, larger engine), they must be engineered.
cheers
michael
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