Supercharger legal in WA?

[Carlos the bastard]

I have a Powerdyne 5psi supercharger fitted on my VX SS, what is the story with certification, insurance and the law?
It was installed by a repuitable workshop, by an engineer, but I have no paperwork.
Am I required to produce anything if stopped and questioned by police?
What about my insurance company?
I dont want to have an accident and be told becauce of the modifications, no insurance.
Advice would be appriciated.
Carl

[cpbait]

defenatly tell your insurance company as yeh if you have an accident they will wipe you, mainly cause youve altered the vehicle and made it more powerfull, not sure with wa laws as i'm from victoria