Removing the H-pipe M2C (EU 2021)

JulienP · 09-18-2023, 09:38 AM

Hi everyone,

I'm reaching out to discuss a specific concern I have regarding the exhaust setup on the 2021 BMW M2 Competition (EU). I've come across the Grail exhaust system which seems to have removed the H-pipe.

Grail exhaust: trackparts.ch/GRAIL-BMW-M2-Competition-F87-Klappenabgasanlage

My main concern is about the implications of removing the H-pipe, especially when the OPF (particulate filter) remains untouched. Can this potentially throw the car into Safety mode/Limp mode?

Stock H-pipe:

I'm eager to hear your experiences or insights on this matter. Has anyone faced any issues with such modifications? Are there any technical reasons why the H-pipe was removed in the Grail setup?

Thank you in advance for sharing your knowledge.

Best regards,
J

JulienP · 11-30-2023, 10:52 AM

Still interested and grateful for any responses.

squixs · 12-01-2023, 06:39 AM

I think it's best to contact the manufacturer to verify whether this exhaust "flows enough" to trigger warnings/errors in the OPF pressure systems. Some exhausts have been specifically designed and manufactured with this in mind (Akra, Remus Sport, all EC-approved) while others can potentially trigger a warning because of the backpressure differences.

Should this be the case, you can always consider removing the OPF and installing LEIB OPF-deleter connectors which will bypass the monitors without having to flash the DME.

09-18-2023, 09:38 AM	#1
JulienP Registered 0 Rep 2 Posts Drives: M2C Join Date: Sep 2023 Location: Switzerland iTrader: (0)	Removing the H-pipe M2C (EU 2021) Hi everyone, I'm reaching out to discuss a specific concern I have regarding the exhaust setup on the 2021 BMW M2 Competition (EU). I've come across the Grail exhaust system which seems to have removed the H-pipe. Grail exhaust: trackparts.ch/GRAIL-BMW-M2-Competition-F87-Klappenabgasanlage My main concern is about the implications of removing the H-pipe, especially when the OPF (particulate filter) remains untouched. Can this potentially throw the car into Safety mode/Limp mode? Stock H-pipe: I'm eager to hear your experiences or insights on this matter. Has anyone faced any issues with such modifications? Are there any technical reasons why the H-pipe was removed in the Grail setup? Thank you in advance for sharing your knowledge. Best regards, J Last edited by JulienP; 09-18-2023 at 09:53 AM..
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11-30-2023, 10:52 AM	#2
JulienP Registered 0 Rep 2 Posts Drives: M2C Join Date: Sep 2023 Location: Switzerland iTrader: (0)	Still interested and grateful for any responses.
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12-01-2023, 06:39 AM	#3
squixs Second Lieutenant 111 Rep 244 Posts Drives: BMW M2 Competition Join Date: Oct 2015 Location: Germany iTrader: (0)	I think it's best to contact the manufacturer to verify whether this exhaust "flows enough" to trigger warnings/errors in the OPF pressure systems. Some exhausts have been specifically designed and manufactured with this in mind (Akra, Remus Sport, all EC-approved) while others can potentially trigger a warning because of the backpressure differences. Should this be the case, you can always consider removing the OPF and installing LEIB OPF-deleter connectors which will bypass the monitors without having to flash the DME.
	Appreciate 0 Quote