Z M Roadster S52 Catalytic converter - Bimmerfest - BMW Forums

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Old 07-29-2012, 06:30 PM
tvision321 tvision321 is offline
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Z M Roadster S52 Catalytic converter


My recently purchased 1999 BMW M Roadster S52 has a mid pipe section that is rusted out at the flanges; upon further inspection, the catalytic converters where gutted and then re-welded into position.

Any one with a used NOS piece? parting out a Z3M S52?

Or is there a reasonable after market replacement?

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Old 08-01-2012, 04:29 PM
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Randy Forbes Randy Forbes is offline
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Not sure where I read it/heard it, but I think it's unlawful to sell a secondhand catalytic converter. AN easy test would be to call a salvage yard and ask the question; they'd know.

Compared to the cost of OEM, I'm certain you'd be bucks ahead by buying aftermarket high-flow catalytic converters, and having a local muffler/tuner shop to make up a new mid-pipe section.

Randy Forbes
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Old 08-02-2012, 05:52 AM
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Pinecone Pinecone is offline
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(5) What about using converters from salvage yards or junked cars?

EPA considers it a violation of the policy to install a used converter from a salvage yard or sell it for reuse unless it has been properly tested and labeled. Similarly, it is a violation to install an untested used converter brought in by a customer, even if the customer insists that the used converter came off his/her vehicle. Salvage or junk yards also would be considered liable for causing tampering if they sell converters that have not been tested or do not meet the requirements outlined in the policy and if the
converters are subsequently installed by parties named in the Clean Air Act as prohibited from tampering.
Complete doc at:


All that said, there are used cats for sale on eBay.
Terry Carraway

'95 Alpine M3 LTW
'00 Dakar M Roadster
'02 Topaz M3
Red/White SRF #4 (Chassis 561)
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