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Aftermarket m271 Catalytic Converters

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Old Jun 5, 2012 | 10:27 PM
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Aftermarket m271 Catalytic Converters
Are there any on the market? Magnaflow, borla. . . whatever? I want to replace my junk Kleemann high flow on my Kleemann headers but I can't seem to find a suitable replacement. Anyone please chime in!
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Old Jun 6, 2012 | 09:20 AM
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Anyone? Are there any at all?
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Old Jun 6, 2012 | 09:55 AM
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Magnaflow doesn't list any on its site. And Borla doesn't even list MB applications.

So unless you go with a universal, you may be stuck with what you got. What's wrong with the Kleemann? I'm sure it wasn't cheap.
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Old Jun 6, 2012 | 10:05 AM
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Originally Posted by tommy
Magnaflow doesn't list any on its site. And Borla doesn't even list MB applications.

So unless you go with a universal, you may be stuck with what you got. What's wrong with the Kleemann? I'm sure it wasn't cheap.
The insulation in the cat is all effed up so its pretty much pointless. I may as well just take that out and straight pipe it.
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Old Jun 6, 2012 | 11:07 AM
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Maybe you could do a M111 retrofit. Much fewer issues.
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Old Jun 6, 2012 | 05:07 PM
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If the cat is breaking down then get rid of it immediately. The design of the M271 with the cat so close to the engine it is very likely to suck broken material back in if the cat is breaking up (hit it, if it rattles its time to go).

Nissan Sentras were notorious for this, grenading engines.

Cannot run without a cat on the M271. Jose aka Mig888 tried, couldn't ever get it right even with an O2 sensor spacer and sim.
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Old Jun 6, 2012 | 09:50 PM
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Originally Posted by tommy
Maybe you could do a M111 retrofit. Much fewer issues.
It probably is the better motor
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Old Jun 6, 2012 | 09:51 PM
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Originally Posted by amanonfire
If the cat is breaking down then get rid of it immediately. The design of the M271 with the cat so close to the engine it is very likely to suck broken material back in if the cat is breaking up (hit it, if it rattles its time to go).

Nissan Sentras were notorious for this, grenading engines.

Cannot run without a cat on the M271. Jose aka Mig888 tried, couldn't ever get it right even with an O2 sensor spacer and sim.
Im running stock headers at the moment. Im looking to get the Kleemann cat replaced. Did it affect his performance or was it just throwing a CEL?
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Old Jun 7, 2012 | 12:51 AM
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Will a high flow cat change the sound? i want it too be nice without being ricy
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Old Jun 7, 2012 | 11:40 AM
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Originally Posted by CoupeCrazy03
Im running stock headers at the moment. Im looking to get the Kleemann cat replaced. Did it affect his performance or was it just throwing a CEL?
CEL mostly, yet it does affect performance a bit as the O2 sensors are part of the feedback loop.

You could weld the stock cat into the Kleemann header.
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Old Jun 7, 2012 | 11:51 AM
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I happened to find out about these Thunderbolt racing 3inch spum metallic race cats.

http://performance-curve.com/3thunde...ter415300.aspx

They seem very affordable, im gonna inquire about these soon.
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Old Jun 7, 2012 | 11:59 AM
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The "not for use in California" doesn't worry you? Or do you have an out on the inspection?
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Old Jun 7, 2012 | 12:23 PM
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Originally Posted by tommy
The "not for use in California" doesn't worry you? Or do you have an out on the inspection?
Nah, I just swap out to stock when i go for a smog check. I already passed smog recently so I should be good for quite a while.
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