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-   -   cat delete question (http://www.bimmerfest.com/forums/showthread.php?t=620354)

tchavera 05-11-2012 04:13 PM

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

drivinfaster 05-12-2012 06:22 AM

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

tchavera 05-12-2012 08:29 AM

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

Sent from my SCH-I500 using Bimmer App

jaguarx7 05-12-2012 01:13 PM

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.

tchavera 05-12-2012 02:18 PM

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

Sent from my SCH-I500 using Bimmer App

DinanM3e36 05-12-2012 02:26 PM

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)

HakenTT 05-12-2012 03:14 PM

Quote:

Originally Posted by tchavera (Post 6828745)
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.

DinanM3e36 05-12-2012 03:24 PM

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

Moeman10 05-12-2012 03:34 PM

Quote:

Originally Posted by jaguarx7 (Post 6830050)
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.

http://i1003.photobucket.com/albums/...-12-02_597.jpg

tchavera 05-12-2012 05:51 PM

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

jaguarx7 05-12-2012 06:39 PM

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.

Mr Gusta 05-12-2012 06:44 PM

obd2 gets a CEL

obd1 doesnt get a cel because the only 02 sensor is precat

DinanM3e36 05-12-2012 08:33 PM

1 Attachment(s)
Do this muffler/cat delete...electronic valve control back pressure, custom switch to adjust to your liking (pull the cel bulb out jk)

S54

http://www.youtube.com/watch?v=pUaDuvmYP-M&sns=em

Moeman10 05-13-2012 01:50 PM

you're driving a 323, you will see power gains from yanking your cats.

kmorgan_260 11-19-2012 03:54 AM

OP, how did this work out for you? I am thinking of doing something similar.

ReillyM3 11-19-2012 10:29 AM

Quote:

Originally Posted by kmorgan_260 (Post 7202546)
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.

BustedE36 11-19-2012 11:37 AM

Quote:

Originally Posted by ReillyM3 (Post 7203074)
"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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