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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 > cat delete



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      01-21-2013, 10:09 AM   #1
crasa21
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cat delete

Just as the title states, I want to delete all catalytic converters. Will this throw any codes? Performance gains vs. sound? Don't really care about performance unless mpg increases.

The reason: I dented my exhaust pipe before the first cats and I can straight pipe a lot easier than replacing and re-welding everything.
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      01-21-2013, 11:24 AM   #2
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      01-21-2013, 04:53 PM   #3
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Step 1 - click search
Step 2 - read
Step 3 - learn
Step 4 - Remember to search before posting next time you have a bright idea
:
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      01-21-2013, 09:27 PM   #4
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well penis, I can't use the search feature when I am on my phone. it automatically goes to the google search. and I really don't think deleting the cats is a bright idea. I'm sure in AR it is a general hillbilly practice to do this, but I'm just cheap.
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      01-21-2013, 11:18 PM   #5
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well penis, I can't use the search feature when I am on my phone. it automatically goes to the google search. and I really don't think deleting the cats is a bright idea. I'm sure in AR it is a general hillbilly practice to do this, but I'm just cheap.
You should learn your demographics before you attempt to swing personal insults. Hillbilly is a term primarily for the Appalachian area. I've heard it used as a term for people in the Ozarks. Being from the Ouachita area, we are known as Rednecks.

If you knew how to use the search feature, you would know you can click on advanced search and search from your phone.
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      01-21-2013, 11:26 PM   #6
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Originally Posted by Johnny D View Post
You should learn your demographics before you attempt to swing personal insults. Hillbilly is a term primarily for the Appalachian area. I've heard it used as a term for people in the Ozarks. Being from the Ouachita area, we are known as Rednecks.

If you knew how to use the search feature, you would know you can click on advanced search and search from your phone.
or better yet search "Cat delete on N52" in Google with plenty of results on your phone.
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      01-22-2013, 02:40 AM   #7
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get em my fellow arkansas freind get em lol
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      01-22-2013, 09:32 AM   #8
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redneck is a coalminer term, and is far from derogatory stemming from it's original meaning. as far as my phone is concerned, anything I push it immediately goes to google search. as far as hillbilly, I used that as a stereotypical term referring to more your mentality rather than geographic location. next!
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      01-22-2013, 12:48 PM   #9
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redneck is a coalminer term, and is far from derogatory stemming from it's original meaning. as far as my phone is concerned, anything I push it immediately goes to google search. as far as hillbilly, I used that as a stereotypical term referring to more your mentality rather than geographic location. next!
You're partially right. It is a coal miners term that came around in the early 20th century, but it is also a term for a poor southerner and has been around as long. So we are both correct.


You specifically said AR in your insults. Don't kid yourself... You attempted to use my geographic location to insult me.

What phone do you own?
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      01-22-2013, 12:58 PM   #10
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Quote:
Originally Posted by crasa21 View Post
Just as the title states, I want to delete all catalytic converters. Will this throw any codes? Performance gains vs. sound? Don't really care about performance unless mpg increases.

The reason: I dented my exhaust pipe before the first cats and I can straight pipe a lot easier than replacing and re-welding everything.
The first (primary) cats are located in the exhaust headers so I can only assume you dented your exhaust before the 2ndary cats. People delete the 2nd cats all the time and it will not throw an error code because the last O2 sensor is well before that. From what I have been reading on the forums it should give you a bit of a gain in HP and every time you gain HP from the exhaust side you should gain a slight amount of fuel economy. I can't comment about your emission laws but I hear that the primary cat does most the work so you should be fine.
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      01-22-2013, 03:17 PM   #11
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      01-22-2013, 04:30 PM   #12
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Yes cat delete of main cat does through codes, 20hp if not more
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      01-22-2013, 04:49 PM   #13
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I have a samsung gs3. I'm on the sprint network. Yes, I did use your geographic location to insult you. However, the term "hillbilly" was meant to demean (spelling, sorry) the mentality or intellegence of you due to your geographic location.

And I guess it looks like I'm a hillbilly also since I can't figure out a simple search function on my phone. Lol

Now, back to the topic: thank you everyone that gave me straight jt
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      01-22-2013, 07:05 PM   #14
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You should understand what cats are and where they're located before you go sawing things off.
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      01-22-2013, 09:57 PM   #15
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      01-23-2013, 06:45 AM   #16
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I understand exactly what the cats do and also how they accomplish it. What I don't understand is what all the sensors do. Well, why all the sensors. I understand the theory of them, most anyway.
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      01-23-2013, 08:47 AM   #17
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