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      03-25-2022, 10:56 PM   #1
NorthernDancer
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Where are my secondary cats?

I don't see them anywhere on realoem.com
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      03-26-2022, 09:33 AM   #2
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2011 BMW 128i  [0.00]
N51 shows this

https://www.realoem.com/bmw/enUS/sho...diagId=18_0776
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      03-26-2022, 12:12 PM   #3
NorthernDancer
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Thanks but on realoem for N52, no secondary cats.
The very long center exhaust pipe:
N51 18 30 7 560 008 $2170.94
N52 18 30 7 560 015 $2235.75 [more expensive but no cats?]
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      03-26-2022, 01:39 PM   #4
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2013 128i  [9.58]
Quote:
Originally Posted by NorthernDancer View Post
Thanks but on realoem for N52, no secondary cats.
The very long center exhaust pipe:
N51 18 30 7 560 008 $2170.94
N52 18 30 7 560 015 $2235.75 [more expensive but no cats?]
The description of P/N 18 30 7 560 015 is "RP-catalyic converter + front muffler"
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      03-27-2022, 06:05 PM   #5
Olgeezer1
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Quote:
Originally Posted by NorthernDancer View Post
I don't see them anywhere on realoem.com
They're there Mike, just have a look under the car. Had mine removed, can't believe how restrictive they are when I got a good look at them. Nice , very subtle improvement in sound + slight mpg and a few horsepower gained. Had a look at RealOEM -that picture is just not accurate. Doesn't show the 2ndary cats and calls the resonator a muffler/ cat which it's not. Not even close.

Last edited by Olgeezer1; 03-29-2022 at 02:31 PM.. Reason: 2nd look
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      03-29-2022, 12:56 AM   #6
carscatscoffee15
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Quote:
Originally Posted by Olgeezer1 View Post
They're there Mike, just have a look under the car. Had mine removed, can't believe how restrictive they are when I got a good look at them. Nice , very subtle improvement in sound + slight mpg and a few horsepower gained.

Second this. It completes it for me.

Slight mpg gain is subjective. It went down for me as the car sounds so much nicer because of the horsepower gained 😉

I decided to keep them just in case I ever sell the car or decide to go back to stock. Plus they are expensive! I did the same for my primaries when I did my headers.
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      06-24-2022, 09:34 AM   #7
subilife
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Does it throw a code when you remove the secondary cats?
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      06-26-2022, 05:53 PM   #8
RaddDroid7
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Quote:
Originally Posted by subilife View Post
Does it throw a code when you remove the secondary cats?
I'd like to know as well
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      06-26-2022, 06:01 PM   #9
iamroddy
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It shouldn't...there's no sensor after the secondaries.
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