Quote:
Originally Posted by Kato
I have gone through the Road Traffic Act for WA and the ADR's on mufflers and haven't found any reference to any silencing making an exhaust illegal. However, I am open to anyone discussing any other information they have found, or their interpretation as it is a very big point to sort out.
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I did the same after reading an article in a Top Gear Australia magazine that said something along the lines of
"a remote controlled version of HSV's bi-modal exhaust would not comply with ADR." I couldn't find any reference to variable or bi-modal exhaust systems in the relevant legislation.
From a legal perspective, there is no reason to deem a variable exhaust system illegal if it complies with all regulations and standards in both the fully open and closed position. If the system wouldn't comply when fully open (eg: bypasses the muffler such as the screamer example above) then it would be illegal. That is not the case here.