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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 > Any N52 Owners with High Flow Cats?



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      12-27-2010, 09:45 PM   #1
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Any N52 Owners with High Flow Cats?

If so, could you post which brand you went with? Also was it 100 cell? How was fitment / install?

Any drone, smell, etc.?


Any before / after dynos?
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      12-27-2010, 11:25 PM   #2
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i took out my secondary cats with my bmw performance exhaust, no drone, no smell
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      12-28-2010, 08:11 AM   #3
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Originally Posted by c_jeong89 View Post
i took out my secondary cats with my bmw performance exhaust, no drone, no smell
Did you notice any power? Do you like the sound?
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      12-28-2010, 04:02 PM   #4
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i like the sound just a bit louder. Power wise, on paper it should be there but can i feel it, not really. Wasn't expecting to either but I wanted to make the exhaust a little louder and this was the only way to go without touching the primary cats.
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      12-28-2010, 05:23 PM   #5
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Quote:
Originally Posted by c_jeong89 View Post
i like the sound just a bit louder. Power wise, on paper it should be there but can i feel it, not really. Wasn't expecting to either but I wanted to make the exhaust a little louder and this was the only way to go without touching the primary cats.
Thats cool- I'd like to hear it a bit more when the windows are up.
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      12-28-2010, 05:49 PM   #6
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Quote:
Originally Posted by c_jeong89 View Post
i took out my secondary cats with my bmw performance exhaust, no drone, no smell
will it show the engine light when you cut it off the cats
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      12-28-2010, 06:36 PM   #7
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will it show the engine light when you cut it off the cats
You can remove the 2nd cats and not throw a code.
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      12-31-2010, 10:22 PM   #8
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You can remove the 2nd cats and not throw a code.
but i was running supersprint heades
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      01-01-2011, 12:29 AM   #9
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well yea for headers you will need to get an O2 sensor for the code, but that's bc those are primary cats, not secondaries. Deleting secondary cats will not cause any error codes.
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      01-02-2011, 05:43 AM   #10
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I'm still waiting to see the first person go in for a sniffer test with headers and the secondaries still installed. That'll probably be the deal breaker for me.
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      01-02-2011, 10:07 AM   #11
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I'm still waiting to see the first person go in for a sniffer test with headers and the secondaries still installed. That'll probably be the deal breaker for me.
Do they sniff OBDII cars in CO? In AZ they just pull the data from the O2 sensors via the diagnostic port. There is still a visual inspection tho'.
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      01-02-2011, 10:09 AM   #12
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Quote:
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Do they sniff OBDII cars in CO? In AZ they just pull the data from the O2 sensors via the diagnostic port. There is still a visual inspection tho'.
depends what county you live in
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      01-03-2011, 05:02 AM   #13
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Douglas does the sniffer, visual and scan. Its a bitch to live here some times...
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