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E46 M3 (2001-2006) Engine: S54 - Max Hp: 333 hp at 7,900 rpm / 262 lb/ft at 4,900 rpm
Total Produced: 45,000+ - Years Produced: 2001 to 2006.


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Old Mon, Nov-13-2017, 02:13:57 AM   #41
icecream
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Default Re: OEM cats vs Euro Cats vs CSL Cats vs ALL other cats

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Originally Posted by usdmej View Post
yes even with a functioning SAP there's a noticeable smell during cold startup with euro cats that you don't get with usdm headers
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Originally Posted by Cha5en View Post
Is there, really? I never smelled/noticed a difference.


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I have oe us cats and there is definitely an oder on cold start. They have 180k on them but no cel.
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Old Mon, Nov-13-2017, 02:20:51 AM   #42
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Default Re: OEM cats vs Euro Cats vs CSL Cats vs ALL other cats

Probably because they’re old? I think a US car with that many miles in its cats would produce the same odor.


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Old Mon, Nov-13-2017, 12:55:39 PM   #43
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Default OEM cats vs Euro Cats vs CSL Cats vs ALL other cats

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Originally Posted by Cha5en View Post
Is there, really? I never smelled/noticed a difference.


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That's odd. My Euro headers, stock sec1/2, RE el Diablo muffler, and TTFS tune. My entire house smells when I back mine out of the garage in the morning. I don't mind the smell but some people can't stand it haha. I still have SAP as well and it's quite a strong odor with no cats.


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Last edited by Zroman610; Mon, Nov-13-2017 at 01:09:33 PM.
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Old Mon, Nov-13-2017, 04:58:08 PM   #44
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Default Re: OEM cats vs Euro Cats vs CSL Cats vs ALL other cats

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Maybe. Assuming 200cpi vs. 400cpi, a square inch of 200cpi = 14.14 cells x 14.14 cells, and a square inch of 400cpi = 20 cells x 20 cells. The 200cpi (assuming square cells, which they are not in reality) cells have 0.0707" sides, while the 400cpi's cells have 0.05" sides. 0.0707" per side * 4 sides * 200 cells = 56.56 in^2 of surface area per square inch of cross-section that is in contact with the exhaust flow per unit length along the body. 0.05" per side * 4 sides * 400 cells = 80 in^2. Assuming the per unit length loss coefficient is the same for the two different cells, the 200 cpi would have lower losses than the 400 cpi as long as it's less than 80/56 = 1.43 times longer.

You'd also have to look at the losses associated with transitioning the freestream exhaust into and out of the cells. I think it's logical to assume that higher cell density = higher losses, but I'm not sure of any sensible way to compare without learning those loss coefficients through experiment. That's not all of the variables, but probably two of the biggest assuming same placement of the cat.
Sp the length of travel would not have any effect, simply resistance of the 400cpi which the exhaust must pass through compared to the lower resistance which the 200cpi must travel through, is the major portion of consideration?

Last edited by bmw m3 s50; Mon, Nov-13-2017 at 05:01:22 PM.
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Old Mon, Nov-13-2017, 05:50:28 PM   #45
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Default OEM cats vs Euro Cats vs CSL Cats vs ALL other cats

Ahh you guys are talking about cat less 100%

I have the euro cats. (Complete Europe exhaust setup)

The US cats compared to the EURO cats had no noticeable smell. Going to catless obviously smelled.
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Old Mon, Nov-13-2017, 06:33:28 PM   #46
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Default Re: OEM cats vs Euro Cats vs CSL Cats vs ALL other cats

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Originally Posted by Cha5en View Post
Ahh you guys are talking about cat less 100%

I have the euro cats. (Complete Europe exhaust setup)

The US cats compared to the EURO cats had no noticeable smell. Going to catless obviously smelled.
Yes without cats,the smell can be unbearable. My clothes always smelled like gasoline/exhaust every time I drove my car which was a coupe.
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Old Mon, Nov-13-2017, 08:25:44 PM   #47
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Default Re: OEM cats vs Euro Cats vs CSL Cats vs ALL other cats

Quote:
Originally Posted by Cha5en View Post
Ahh you guys are talking about cat less 100%

I have the euro cats. (Complete Europe exhaust setup)

The US cats compared to the EURO cats had no noticeable smell. Going to catless obviously smelled.
I found it is slightly smellier on cold starts compared to US headers, but that quickly goes away.
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Old Mon, Nov-13-2017, 08:26:23 PM   #48
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Default Re: OEM cats vs Euro Cats vs CSL Cats vs ALL other cats

Oddly enough I never got any in cabin smell while driving catless, either. Definitely smelled it from the outside/behind the car, though.


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Old Wed, Apr-11-2018, 01:44:25 PM   #49
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Default Re: OEM cats vs Euro Cats vs CSL Cats vs ALL other cats

thread revival. Has any one tried to order this part number 18307836508? when you go on tischer it gives this pn for catalytic converter, in the section 1 pipe. i.e euro cats? It would be great if someone could shed some light on this. especially bc there 530 brand new, so something isn't adding up here. I'm assuming its just the us oem section 1, but not sure why its listed with the cats.

https://www.getbmwparts.com/v-2006-b...ust-components
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Old Wed, Apr-11-2018, 02:31:00 PM   #50
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Default Re: OEM cats vs Euro Cats vs CSL Cats vs ALL other cats

Yes, I have. From my understanding the 508 part number is NLA. In the link you referenced, the part number for the catalyst is shown as 18107832909, which is the US section 1 part number, and would be the appropriate price for that version. New Euro cats run $2-3k depending on shipping costs and the process of getting them here if purchased new.

I actually do have a set of 2005 Euro cats that I'm going to be listing soon, I just haven't gotten around to it yet. These have 5,000 miles on them and include new O2 sensors as well, the Euro rail and clip (also NLA) and section 1 to section 2 gaskets. Looking for $1500 if interested.

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Discussing OEM cats vs Euro Cats vs CSL Cats vs ALL other cats in the E46 M3 (2001-2006) Forum - Engine: S54 - Max Hp: 333 hp at 7,900 rpm / 262 lb/ft at 4,900 rpm
Total Produced: 45,000+ - Years Produced: 2001 to 2006. at BMW M3 Forum.com (E30 M3 | E36 M3 | E46 M3 | E92 M3 | F80/X)