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Go Back   Bimmerfest - BMW Forums > BMW Model Discussions > 3 Series / 4 Series > E36 (1991 - 1999)

E36 (1991 - 1999)
The E36 chassis 3-Series BMW was a huge hit among driving enthusiasts from the first moment the car hit the pavement. The E36 won numerous awards over the years it was produced and is still a favorite of many BMW enthusiasts to this day! -- View the E36 Wiki

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  #1  
Old 05-11-2012, 03:13 PM
tchavera tchavera is offline
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cat delete question

k so the comb in my cat is broken a little and the rattle from the inside is so annoying. i just passed emissions so i want to remove the cat. i don't want to do a straight pipe all the way, i want the muffler. does anyone know where i can find a pipe that is bolt on in place of my cat? i know it's out there i just can't find it. i don't want any cutting or welding. thanks
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  #2  
Old 05-12-2012, 05:22 AM
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drivinfaster drivinfaster is offline
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nothing would be available that would be 'legal', so no. i don't think that you'll find a direct bolt on product. shops won't do it, wither, as it is a federal clean air act violation to remove the cat without replacing it on a street car.

your options are deal with it, turn the radio up, or manage to get a different exhaust to either replace or fabricate and swap it out.

either way, there is most likely going to be cutting and/or welding of some sort.




df
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  #3  
Old 05-12-2012, 07:29 AM
tchavera tchavera is offline
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Oh okay. I've seen bolt on replacements for mustangs. I guess I'm gonna have to blow the cone out. I don't know anyone reliable to make one

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  #4  
Old 05-12-2012, 12:13 PM
jaguarx7 jaguarx7 is offline
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If you remove the catalyst from the system you will get a check engine light. Best suggestion is to find a decent used set, they sometimes appear on craigslist.
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  #5  
Old 05-12-2012, 02:34 PM
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Moeman10 Moeman10 is offline
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Quote:
Originally Posted by jaguarx7 View Post
If you remove the catalyst from the system you will get a check engine light. Best suggestion is to find a decent used set, they sometimes appear on craigslist.
No you won't



Also, you could buy an AA track pipe, but those are like $550... not worth it IMO.. This is what mine looks like..

I just cut out my cats and welded in straight pipes.

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  #6  
Old 05-12-2012, 01:18 PM
tchavera tchavera is offline
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I can deal with a check engine light but I figured why not leave an open space. I'm sure it will give a little more power and won't sound obnoxious

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  #7  
Old 05-12-2012, 01:26 PM
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DinanM3e36 DinanM3e36 is offline
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Depends on where you live if you'll fail inspection or not on a cat delete (here in tx you can pass in certain counties and fail in others, Dallas does smog testing but my current county (Wichita) doesn't)
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  #8  
Old 05-12-2012, 02:14 PM
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HakenTT HakenTT is offline
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Quote:
Originally Posted by tchavera View Post
k so the comb in my cat is broken a little and the rattle from the inside is so annoying. i just passed emissions so i want to remove the cat. i don't want to do a straight pipe all the way, i want the muffler. does anyone know where i can find a pipe that is bolt on in place of my cat? i know it's out there i just can't find it. i don't want any cutting or welding. thanks
No one makes nor sells bolt on "test pipes" for BMWs.

Easy solution is to remove the cat, cut 2 inch square on top of it, ice pick the material out of, weld the 2 inch square metal back on it. But back on the car.
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  #9  
Old 05-12-2012, 02:24 PM
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DinanM3e36 DinanM3e36 is offline
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Just knock all the honeycomb crap out of the stock one with a long flathead and hammer it's just ceramic like material and breaks apart easy
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  #10  
Old 05-12-2012, 04:51 PM
tchavera tchavera is offline
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thanks for your help guys. i didn't want to break up the comb because when i have emissions i could put the cat back in as it passed last week. i found a guy who will cut it out and put in a pipe. performance gain? if not who cares.. i'm not trying to buy an exhaust set up
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  #11  
Old 05-12-2012, 05:39 PM
jaguarx7 jaguarx7 is offline
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As his car is a 323is, he will have a check engine light because his car is OBD2. He has 2 O2 sensors, and the one after the cats are there to make sure the cats are doing their job. If the cats are plugged or broken the sensor will detect this and throw a code and check engine light. Only way to fix this is to get an O2 sensor simulator, but your engine performance still won't be optimum. I actually have seen test pipes online for sale online, but they're almost as expensive as a new set of cats. Bottom line is if your cats are broken it is highly recommended that you just replace them.
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Cars are much more compact if you don't take them apart.

There is a theory which states that if anyone ever figures out how and why the universe came to exist it would instantly dissapear, and a less rational, more complicated one would replace it.

There is another theory which states that this has already happend...
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  #12  
Old 05-12-2012, 05:44 PM
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Mr Gusta Mr Gusta is offline
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obd2 gets a CEL

obd1 doesnt get a cel because the only 02 sensor is precat
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  #13  
Old 05-12-2012, 07:33 PM
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DinanM3e36 DinanM3e36 is offline
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Do this muffler/cat delete...electronic valve control back pressure, custom switch to adjust to your liking (pull the cel bulb out jk)

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  #14  
Old 05-13-2012, 12:50 PM
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Moeman10 Moeman10 is offline
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you're driving a 323, you will see power gains from yanking your cats.
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  #15  
Old 11-19-2012, 02:54 AM
kmorgan_260 kmorgan_260 is offline
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OP, how did this work out for you? I am thinking of doing something similar.
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  #16  
Old 11-19-2012, 09:29 AM
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ReillyM3 ReillyM3 is offline
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Originally Posted by kmorgan_260 View Post
OP, how did this work out for you? I am thinking of doing something similar.
"I dont always sleep on luxury executive sedans but when I do I choose Bmw.". Excellent sig pic.
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1994 325i (current)
2006 325i (current)
1995 525i
1990 325i
1988 Jetta 8v
1987 Gti 16v

1985 Jaguar Xj6
1984 Jaguar Xj6
1966 Mustang
1965 Falcon Wagon
1961 Buick Special
1962 Buick Special Wagon
1955 Pontiac Cheiftan
1961 Falcon Tudor
1962 Faclon Ranchero

Last edited by ReillyM3; 11-19-2012 at 09:30 AM.
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  #17  
Old 11-19-2012, 10:37 AM
BustedE36 BustedE36 is offline
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"I dont always sleep on luxury executive sedans but when I do I choose Bmw.". Excellent sig pic.
Bahahahaha win win win, the most interesting cat in the world eh?
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