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These are no longer available / NLA from BMW. Very very small chance that a local dealer has one. They don't come up for sale very often here.
One alternative is to buy a 135i performance muffler, it produces pretty decent results as well - few guys have done that as they are more readily available.
Last but not least, many people have done the "performance muffler mod" - where the stock muffler is gutted to match how a performance muffler is built on the inside - you'd need a shop to cut it open and perform the work. Many have done that also.
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