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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 12-08-2013, 05:35 PM
Noelair24 Noelair24 is offline
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Mein Auto: 1995 325is
Replacing Catalytic Converter 1995 325is

I am replacing my faulty Catalytic Converter I found one from someone parting their car out. Their car is a 97 325 convertible. Shouldn't be a problem right? Should fit? I wanna make sure before I buy.
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  #2  
Old 12-08-2013, 06:21 PM
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ZeGerman ZeGerman is offline
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Since the 325 was replaced by the 328 in '96, there is no such thing as a '97 325. There was also a transition from OBD1 to OBD2, and because of that, if you're using the entire midpipe from the '97 including the cats, you will have some additional oxygen sensor bungs which will need to be plugged if used on your 325.

325 midpipe:


328 midpipe:
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Last edited by ZeGerman; 12-08-2013 at 06:22 PM.
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  #3  
Old 12-08-2013, 06:32 PM
Noelair24 Noelair24 is offline
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http://images.craigslist.org/01515_g...Ja_600x450.jpg

This is the one they are selling me


http://inlandempire.craigslist.org/cto/4204492094.html
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  #4  
Old 12-08-2013, 06:37 PM
Noelair24 Noelair24 is offline
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Quote:
Originally Posted by ZeGerman View Post
Since the 325 was replaced by the 328 in '96, there is no such thing as a '97 325. There was also a transition from OBD1 to OBD2, and because of that, if you're using the entire midpipe from the '97 including the cats, you will have some additional oxygen sensor bungs which will need to be plugged if used on your 325.

325 midpipe:


328 midpipe:
You see my response?
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  #5  
Old 12-08-2013, 06:53 PM
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southpark11235 southpark11235 is online now
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Quote:
Originally Posted by Noelair24 View Post
That is a 323 exhaust which is restrictive. You should wait for a real 325 or 328 exhaust. Also the seller is an idiot. "V6 engine"
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Alex//1999 323is - power e46 M3 seats, style 43 rims, 328 exhaust, Z3 rack, Bilstein PSS coilovers

We got about ten minutes before this entire county is up in flames. If you want to live, youd better step on the gas! Oh wait is this a Tesla? Sh!t! Well, step on the prissy peddle, we're going to die! Cartman
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  #6  
Old 12-08-2013, 07:59 PM
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ZeGerman ZeGerman is offline
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And I repeat, there is no such thing as a '97 325. The seller doesn't know what he's talking about, which is further backed up by the fact that BMW has never made a V6 engine...

Nevertheless, it will fit your car.
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1998 BMW 328is
1966 Pontiac GTO
2007 Subaru Impreza 2.5i 5-door
View my photos: Caught in the Wild
For sale: E30/E36 front sway links
For sale: OEM E36 328 catback
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  #7  
Old 12-09-2013, 12:18 AM
Noelair24 Noelair24 is offline
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Quote:
Originally Posted by southpark11235 View Post
That is a 323 exhaust which is restrictive. You should wait for a real 325 or 328 exhaust. Also the seller is an idiot. "V6 engine"
Restrictive in what way?
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  #8  
Old 12-09-2013, 12:19 AM
Noelair24 Noelair24 is offline
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Quote:
Originally Posted by ZeGerman View Post
And I repeat, there is no such thing as a '97 325. The seller doesn't know what he's talking about, which is further backed up by the fact that BMW has never made a V6 engine...

Nevertheless, it will fit your car.
Thanks a lot! Appreciate the help on the info.
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  #9  
Old 12-09-2013, 02:07 PM
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southpark11235 southpark11235 is online now
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Quote:
Originally Posted by Noelair24 View Post
Restrictive in what way?
In between the headers and muffler the exhaust twitches to a single pipe, which is more restrictive than the dual pipe M3/328/325 exhaust. In order to remove the extra 22 HP from the 323, the only parts BMW changed versus the 328 are the exhaust, tune and crankshaft.
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Alex//1999 323is - power e46 M3 seats, style 43 rims, 328 exhaust, Z3 rack, Bilstein PSS coilovers

We got about ten minutes before this entire county is up in flames. If you want to live, youd better step on the gas! Oh wait is this a Tesla? Sh!t! Well, step on the prissy peddle, we're going to die! Cartman
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  #10  
Old 12-09-2013, 02:41 PM
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ZeGerman ZeGerman is offline
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Quote:
Originally Posted by southpark11235 View Post
In order to remove the extra 22 HP from the 323, the only parts BMW changed versus the 328 are the exhaust, tune and crankshaft.
Well sure, but a difference in the cylinder stroke is significant.
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For sale: E30/E36 front sway links
For sale: OEM E36 328 catback

Last edited by ZeGerman; 12-09-2013 at 02:43 PM.
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  #11  
Old 12-09-2013, 06:24 PM
Noelair24 Noelair24 is offline
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Well sure, but a difference in the cylinder stroke is significant.
So what do you guys recommend I do? If I put the 323 it will slow my car down then right?
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  #12  
Old 12-09-2013, 06:34 PM
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ZeGerman ZeGerman is offline
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Eh, there's probably a bigger difference between the 323 & 328/M3 midpipe than there is between the 323 & 325. The 328 and M3 midpipes are the only ones which don't bottleneck into one tube, so if you're considering going from a 325 midpipe to a 323 midpipe, it won't be a very big difference, if any.
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View my photos: Caught in the Wild
For sale: E30/E36 front sway links
For sale: OEM E36 328 catback
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  #13  
Old 12-09-2013, 06:59 PM
Noelair24 Noelair24 is offline
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My 325is has a dual exhaust on it
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  #14  
Old 12-09-2013, 07:48 PM
Noelair24 Noelair24 is offline
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Quote:
Originally Posted by ZeGerman View Post
Eh, there's probably a bigger difference between the 323 & 328/M3 midpipe than there is between the 323 & 325. The 328 and M3 midpipes are the only ones which don't bottleneck into one tube, so if you're considering going from a 325 midpipe to a 323 midpipe, it won't be a very big difference, if any.
will this 95 m3 cat fit mine? Guy is asking 300 for it. What do you guys think?

http://orangecounty.craigslist.org/pts/4223383243.html
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  #15  
Old 12-09-2013, 08:01 PM
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southpark11235 southpark11235 is online now
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Originally Posted by Noelair24 View Post
will this 95 m3 cat fit mine? Guy is asking 300 for it. What do you guys think?

http://orangecounty.craigslist.org/pts/4223383243.html
That cat will easily fit your car. Around here $300 is way over priced. I paid under $100 for my 328 cat and muffler. However, I do not know your local market, so you will have to use your judgment on that one.
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Alex//1999 323is - power e46 M3 seats, style 43 rims, 328 exhaust, Z3 rack, Bilstein PSS coilovers

We got about ten minutes before this entire county is up in flames. If you want to live, youd better step on the gas! Oh wait is this a Tesla? Sh!t! Well, step on the prissy peddle, we're going to die! Cartman
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  #16  
Old 12-12-2013, 11:31 AM
Noelair24 Noelair24 is offline
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Originally Posted by southpark11235 View Post
That cat will easily fit your car. Around here $300 is way over priced. I paid under $100 for my 328 cat and muffler. However, I do not know your local market, so you will have to use your judgment on that one.
OK I got it for 280. So when I change it I wanna replace all the oxygen sensors. How many of them is there? And where could I find em for a good price? I found a lot of good stuff on eBay. Km thinking there. Just need to know how many it is.
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  #17  
Old 12-12-2013, 11:40 AM
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southpark11235 southpark11235 is online now
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^Just one right before the cat.
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Alex//1999 323is - power e46 M3 seats, style 43 rims, 328 exhaust, Z3 rack, Bilstein PSS coilovers

We got about ten minutes before this entire county is up in flames. If you want to live, youd better step on the gas! Oh wait is this a Tesla? Sh!t! Well, step on the prissy peddle, we're going to die! Cartman
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  #18  
Old 12-12-2013, 11:43 AM
Noelair24 Noelair24 is offline
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Originally Posted by southpark11235 View Post
^Just one right before the cat.
OK thanks. Do you recommend I replace all the oxygen sensors tho?
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  #19  
Old 12-12-2013, 11:47 AM
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ZeGerman ZeGerman is offline
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Your 325 is OBD1, so I believe it just has one pre-cat O2 sensor and nothing else. This means that you'll have a lot of unused oxygen sensors on that midpipe you just bought. You can either just leave them in place and not connected to anything, or you can remove them and install bung[holio] plugs.
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1998 BMW 328is
1966 Pontiac GTO
2007 Subaru Impreza 2.5i 5-door
View my photos: Caught in the Wild
For sale: E30/E36 front sway links
For sale: OEM E36 328 catback
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  #20  
Old 12-12-2013, 12:11 PM
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southpark11235 southpark11235 is online now
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Originally Posted by Noelair24 View Post
OK thanks. Do you recommend I replace all the oxygen sensors tho?
"all sensors" . I just told you, you only have one. If the sensor is working fine, I would not replace it. However replacing it will not hurt anything.
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Alex//1999 323is - power e46 M3 seats, style 43 rims, 328 exhaust, Z3 rack, Bilstein PSS coilovers

We got about ten minutes before this entire county is up in flames. If you want to live, youd better step on the gas! Oh wait is this a Tesla? Sh!t! Well, step on the prissy peddle, we're going to die! Cartman
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  #21  
Old 12-12-2013, 12:19 PM
Noelair24 Noelair24 is offline
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Thanks a lot guys. I'll keep you guys updated on my replacement
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  #22  
Old 12-12-2013, 04:12 PM
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drivinfaster drivinfaster is online now
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that pic wasn't a 95 anything,....it was obd2, which is 96 and newer.

as for the o2 sensors, there are only post cat sensors on the obd2 exhausts, which monitor the efficiency of the cats and will not have any input in the obd1 chassis.

you will need to either weld in a bung for the o2 sensor (use the inboard pipe), or use an obd2 manifold, which is where the o2 sensors go on od2 cars.


as for cats, you could have gotten one from bosal for just over 300, and although it is listed as not for sale in cali, i think that is splitting hairs over hypocritical since buying used is just as verbotin....



df
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Old 12-12-2013, 04:41 PM
Noelair24 Noelair24 is offline
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Originally Posted by drivinfaster View Post
that pic wasn't a 95 anything,....it was obd2, which is 96 and newer.

as for the o2 sensors, there are only post cat sensors on the obd2 exhausts, which monitor the efficiency of the cats and will not have any input in the obd1 chassis.

you will need to either weld in a bung for the o2 sensor (use the inboard pipe), or use an obd2 manifold, which is where the o2 sensors go on od2 cars.


as for cats, you could have gotten one from bosal for just over 300, and although it is listed as not for sale in cali, i think that is splitting hairs over hypocritical since buying used is just as verbotin....



df
which pic?
http://orangecounty.craigslist.org/pts/4223383243.html

This guy has a 95 and 99 Cat
I'm buying the 95 one for my car. Its off a M3

Last edited by Noelair24; 12-12-2013 at 04:44 PM.
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  #24  
Old 12-12-2013, 04:49 PM
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the pic you have listed is obd2. look at the sensors behind the cats, before the resonators.

there is no o2 sensor bung before the cats since the obd2 sensors were on the manifolds, and there are 2 cats.


95 will only have 1 sensor, and be be a 2-into-1 before the cat, not 2 pipes with 2 cats as the picture you posted.




df
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  #25  
Old 12-14-2013, 07:58 AM
vmaxman vmaxman is offline
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$280 for used cats?? i bought 2 brand new magnaflow cats that are CARB compliant for $70 a piece, and they flow much better than stock cats. I bought them on amazon Good luck on the used ones you purchased, i hope they are still good.

jason
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