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      07-28-2019, 12:18 PM   #1
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Best Cat-back exhaust w/o Sensor/CEL

Recently bought my new M2C and finally hit 1200 miles. Since receiving my break-in service I am in the market for a new exhaust system since the current setup is not loud enough. I am looking for a Cat-back exhaust which will not show any CEL or OPF(?) Sensor issues WITHOUT a tune. Ideally the exhaust will be valved since I don't want to disturb my neighbors when I leave for work around 6am.

The systems I have considered thus far:
- Eisenmann Competition Valved System (not sure if center pipe throws any issues)
- Active Autoworke (my favorite sounding from the few clips all these exhaust have)
- Remus
- Milltek

Can anyone offer opinions or insight from their own exhaust systems.

Thanks!
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      07-28-2019, 12:44 PM   #2
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US spec cars don't have OPF or OPF sensor so none of the catback exhausts will throw a CEL. As long as you don't touch the primary cats, you should be fine. If yours is EU spec car with OPF then it's a different story. I'll let other members with OPF equipped M2Cs chime in regarding which options are CEL-friendly. However, I remember reading even Remus Race axle back threw a CEL on some M2Cs with OPF.
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      07-28-2019, 12:48 PM   #3
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None of the catback will cause you any issues or limps because you have not OPFs, so you are spoiled for choice.
I think all those exhausts sound nice, my preference goes to Milltek but it is subjective.
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      07-28-2019, 01:23 PM   #4
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Quote:
Originally Posted by cntzl View Post
US spec cars don't have OPF or OPF sensor so none of the catback exhausts will throw a CEL. As long as you don't touch the primary cats, you should be fine. If yours is EU spec car with OPF then it's a different story. I'll let other members with OPF equipped M2Cs chime in regarding which options are CEL-friendly. However, I remember reading even Remus Race axle back threw a CEL on some M2Cs with OPF.
Quote:
Originally Posted by _RS4_ View Post
None of the catback will cause you any issues or limps because you have not OPFs, so you are spoiled for choice.
I think all those exhausts sound nice, my preference goes to Milltek but it is subjective.
Thanks for letting me know that my US spec car doesn't have OPF

I guess my decision is down to pricing, bang for your buck.
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      07-30-2019, 11:44 AM   #5
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REMUS exhaust + Active Autowerke midpipe sounds the best in my opinion , full Active Autowerke is a close second
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      07-30-2019, 12:11 PM   #6
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Quote:
Originally Posted by mike@x-ph.com View Post
REMUS exhaust + Active Autowerke midpipe sounds the best in my opinion , full Active Autowerke is a close second
It's also probably one of the loudest lol
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      07-30-2019, 12:35 PM   #7
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Quote:
Originally Posted by mike@x-ph.com View Post
REMUS exhaust + Active Autowerke midpipe sounds the best in my opinion , full Active Autowerke is a close second
Quote:
Originally Posted by warrenw View Post
It's also probably one of the loudest lol
Just purchased the full Active Autowerke setup from mike @ X-ph.com.

I'll post videos of the setup once I get the exhaust and install it. It will be installed on a stock 2020 M2C.
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      07-30-2019, 12:36 PM   #8
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Quote:
Originally Posted by Detoxified View Post
Just purchased the full Active Autowerke setup from [user]Mike@X-ph.com[/user].

I'll post videos of the setup once I get the exhaust and install it. It will be installed on a stock 2020 M2C.
Cant wait to hear your feedback, congrats
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      07-30-2019, 12:59 PM   #9
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Quote:
Originally Posted by Detoxified View Post
Just purchased the full Active Autowerke setup from mike @ X-ph.com.

I'll post videos of the setup once I get the exhaust and install it. It will be installed on a stock 2020 M2C.
Do you mean the AA Signature exhaust? Stock downpipes?
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      07-30-2019, 01:18 PM   #10
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Quote:
Originally Posted by _RS4_ View Post
Do you mean the AA Signature exhaust? Stock downpipes?
Yes, thanks for the clarification.
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      07-30-2019, 03:56 PM   #11
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Quote:
Originally Posted by Detoxified View Post
Yes, thanks for the clarification.
Great choice, looking forward to seeing some videos

Last edited by VIERsr; 07-30-2019 at 04:14 PM..
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      07-30-2019, 04:06 PM   #12
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AA mid and remus race rear won't throw any CELs. It's pretty good at being dr jekyll and mr hyde. Efficient mode is only ever so slightly louder than stock. Sport + is an animal.
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      07-31-2019, 12:02 PM   #13
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Best is subjective, but AA midpipe + Remus or full AA is the "Best" in my opinion. The Remus setup pairs surprisingly well with the midpipe.

I have full AA exhaust, but the fitment is pretty bad. I've had multiple shops look as well.. all agreed with my installation.
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      07-31-2019, 12:48 PM   #14
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Quote:
Originally Posted by hlm2c View Post
AA mid and remus race rear won't throw any CELs. It's pretty good at being dr jekyll and mr hyde. Efficient mode is only ever so slightly louder than stock. Sport + is an animal.
+1
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      07-31-2019, 06:51 PM   #15
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Iv got the Remus race + opf back pipes and tbh, i'm still not happy with the sound. Few more weeks and il probably be ordering the AA mid from the US and getting the sensors disabled...should have done this from the start.
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      07-31-2019, 07:26 PM   #16
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If you plan on going

catless: AA Mid, Remus Sport Rear
catted: AA Mid, Remus Race Rear
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      07-31-2019, 08:55 PM   #17
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Quote:
Originally Posted by bmwfan1234 View Post
Iv got the Remus race + opf back pipes and tbh, i'm still not happy with the sound. Few more weeks and il probably be ordering the AA mid from the US and getting the sensors disabled...should have done this from the start.
The midpipe does not trigger any sensors

Quote:
Originally Posted by Juicehead View Post
If you plan on going

catless: AA Mid, Remus Sport Rear
catted: AA Mid, Remus Race Rear
+1
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      08-01-2019, 01:57 AM   #18
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Quote:
Originally Posted by FSU_Logan View Post
Best is subjective, but AA midpipe + Remus or full AA is the "Best" in my opinion. The Remus setup pairs surprisingly well with the midpipe.

I have full AA exhaust, but the fitment is pretty bad. I've had multiple shops look as well.. all agreed with my installation.
Agree it's very subjective. To me Eisenmann sounds the most aggressive/deep in tone and I'm planning to pair it with the AA midpipe.
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      08-01-2019, 05:13 AM   #19
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Quote:
Originally Posted by mike@x-ph.com View Post
The midpipe does not trigger any sensors
I have an OPF equipped car unfortunately...
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      08-01-2019, 10:07 AM   #20
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Quote:
Originally Posted by Juicehead View Post
If you plan on going

catless: AA Mid, Remus Sport Rear
catted: AA Mid, Remus Race Rear

I'd like to elaborate on this a bit more I think.


For a sporty setup that is just a bit louder than stock,

catted: AA Mid, Remus Sport Rear (This keeps the wife happy no matter what mode you are in)

And...

Because Racecar - and still my overall favorite setup

catless: AA Mid, Remus Race Rear

This setup is great for non daily or, most likely DCT. The M6 RPM sits right at 3000 RPM @ 80MPH. So, on the freeway, the "Racecar" setup has a slight buzz at that RPM which disappears either side.
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      08-01-2019, 02:30 PM   #21
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Quote:
Originally Posted by hlm2c View Post
AA mid and remus race rear won't throw any CELs. It's pretty good at being dr jekyll and mr hyde. Efficient mode is only ever so slightly louder than stock. Sport + is an animal.
that is what i always thought but someone , somewhere told me that the ops has a sensor which reads how fast the flow goes and if it is too much the ecu will throw a cel.
He said so speaking about the mperformance exhaust
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      08-01-2019, 02:43 PM   #22
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Quote:
Originally Posted by Big Fabri View Post
that is what i always thought but someone , somewhere told me that the ops has a sensor which reads how fast the flow goes and if it is too much the ecu will throw a cel.
He said so speaking about the mperformance exhaust
AA midpipe by design removes the OPF filters on European cars, so CEL is 100% guaranteed
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