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No side pipes have been legal fitment to both sides in NSW that I know of.
There have been a lot of misinformation about the Robnell side pipes, but they were never ADR approved for fitment to both sides.
I think you might be able to have a drivers side only side pipe if you can make it comply with emmissions & noise.
If you had documentation indicating that side pipes had been previously approved, you have a better chance.
I've sent you a PM with details of an engineer to talk to.
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