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i read that as you can replace shocks OR springs with suitable replacements without an engineering cert, but not with coilovers (not mentioned).

plus i seem to remember something re: adjustable = no no... will try and find

http://autocollective.com.au/nsw-rta/

A vehicle may not be lowered by more than 5cm from standard. Cars fitted with non adjustable suspension which have had adjustable / air suspension replaced in lieu, must be engineered.
  • 4 years later...

This may help on page 19  

http://www.rms.nsw.gov.au/documents/roads/registration/get-nsw-registration/light-vehicle-modifications-manual-suspension-and-ride-height.pdf

6.0 Waystomodifyrideheight

6.1 Standard suspension modifications

Suspension modifications must comply with the component manufacturer’s specifications, or, if these are not available or assessed as being inadequate, VSB 14 Section LS Tyres, Rims, Suspension and Steering.

6.2 Variable suspension modifications

Variable suspension systems must comply with Section LS 1.2, 2.7 and applicable codes of VSB14 as qualified by Appendix B of this Manual.

The suspension system must be a catalogued and quality controlled product complete with full fitting and operating instructions, and be designed and manufactured by a recognised business with experience in supplying reputable suspension systems.

6.3 Changes to wheels and tyres

All tyres fitted to the vehicle must be appropriate to the wheel rim as specified in the Tyre and Rim Standards Manual or in any applicable second edition ADR or third edition ADR. Guidance on modifications to the vehicle’s wheels and tyres, or a combination of the wheels and tyres, is given in VSI 9 

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