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BMW 3-Series (E90 E92) Forum > E90 / E92 / E93 3-series Powertrain and Drivetrain Discussions > NA Engine (non-turbo) / Drivetrain / Exhaust Modifications > Secondary cat delete N53 3.0i



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      08-07-2013, 09:30 AM   #1
styler
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Secondary cat delete N53 3.0i

Hi Guys,

I have searched the forum regarding secondary cat delete. Most who have done it say there are oxygen sensors upstream and downstream of the primary cat.

I have a oxygen sensor just after the secondary cat also. I want to remove the secondary cats, but i'm not sure if in doing so will throw up emission error.

Thanks in advance.
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      08-07-2013, 11:34 AM   #2
BudVlad
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I removed secondary cats by installing Supersprint catless exhaust with O2 sensors. It didnít throw any error and I passed sniffer test with no problem.
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      08-07-2013, 02:27 PM   #3
styler
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Cheers bro. Good to hear. I have custom dual exhaust with no resonator or muffler. Still not loud enough, get a bit of low end boom but not much after 4K revs. Looking to make it scream a bit more.
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      08-07-2013, 09:36 PM   #4
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Got rid of mine with no problem. Just had an exhaust shop weld in some straight piping. But I must have a different setup because i have no O2 sensors after mine
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      08-08-2013, 04:14 AM   #5
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OP be aware that the UK MOT test now requires all factory-fit emissions devices to be in place. So while your car may pass the emissions test, the absence of the cat could be a mandatory fail...
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      08-08-2013, 08:30 AM   #6
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if you have an o2 sensor after you will throw a code. In the US we dont, so a delete isnt an issue.
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      08-08-2013, 10:58 AM   #7
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Quote:
Originally Posted by Rival View Post
if you have an o2 sensor after you will throw a code. In the US we dont, so a delete isnt an issue.
My O2 sensors after secondary cats were installed to Supersprint catless midpipes and I didn’t get any error.
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