Just like there are requirements for owners to notify insurance companies if they want to cover "legal" aftermarket parts, there are also set rules and regulations to ensure that insurance companies don't void cover willy nilly to save some dosh
In saying that, if it is found that an "illegal" modification was "the cause" for the claim then you may not he covered
My advice it to talk to your insurance company, and learn to differentiate between appoved modifications, legal modification, a illegal modification, and general maintenance and replacement of parts
This can/does vary state to state
If in NSW also have a read of this > :
https://www.rms.nsw.gov.au/document...ndards/vsi-06-light-vehicle-modifications.pdf