Yes—running a muffler delete on public roads in Western Australia is generally illegal because your vehicle must have a functioning silencing device and meet noise limits.
If your exhaust is louder than the standard/approved level, expect a defect notice, fines, and a date with an inspection station—romance not included.
Police can conduct roadside checks, and insurers won’t be thrilled if you’ve “liberated” your muffler.
Track-only cars on private property are a different story, but driving them home like a budget V8 Supercar will end badly.
If you must modify, use ADR-compliant components and get it certified; otherwise, keep it legal and keep your neighbours on speaking terms.
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