Short answer: a basic muffler replacement in Australia typically lands around $250–$600 fitted, depending on the car and how rusted the bolts are. A new OEM-style muffler is usually $120–$400 for the part; performance stainless or custom work can push $700–$2,000+ once you add bends and labour.
On the cheap side, a used muffler might be $50–$150 (often found on Tradingpost), but expect $100–$250 to fit it properly, and warranties are about as generous as a parking inspector. Big SUVs, utes, and anything turbo or V8 can cost more, and seized hardware can turn a one-hour job into a three-coffee saga. If the exhaust has leaks elsewhere, a cat-back or full system is $800–$3,000+ fitted, so get a proper quote before committing. Bottom line: budget a few hundred for a straight swap, four figures for fancy; shop around local exhaust specialists and compare itemised quotes.
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