OEM Exhaust Mod

markpetrakis · 05-20-2020, 06:07 PM

Ok, so here’s the deal... I already have my flame suit on just in case. I searched like crazy and was not able to find a single picture of it, but I’m hoping someone has a photo of the stock muffler with the whole thing open??? Every single one I’ve found is either the inside portion open for a perforated mod or the outer portion for the straight through, but I have not been able to find one that shows both being open. Anyone have one or can point me in the right direction? Thank you and flame away

///M Power-Belgium · 05-20-2020, 06:26 PM

Quote:

Originally Posted by markpetrakis

Ok, so here’s the deal... I already have my flame suit on just in case. I searched like crazy and was not able to find a single picture of it, but I’m hoping someone has a photo of the stock muffler with the whole thing open??? Every single one I’ve found is either the inside portion open for a perforated mod or the outer portion for the straight through, but I have not been able to find one that shows both being open. Anyone have one or can point me in the right direction? Thank you and flame away

Sure mate

markpetrakis · 05-20-2020, 07:12 PM

Quote:

Originally Posted by ///M Power-Belgium

Sure mate

Thank you so much!!

///M Power-Belgium · 05-21-2020, 03:06 PM

Quote:

Originally Posted by markpetrakis

Thank you so much!!

No problem mate . For further questions , I'm here

markpetrakis · 05-24-2020, 11:24 AM

Quote:

Originally Posted by ///M Power-Belgium

No problem mate . For further questions , I'm here

It looks like you might have welded shut the small pipe in the hemholtz chamber?? Is that normally an open pipe or just a small off shoot to reduce sound?

///M Power-Belgium · 05-24-2020, 12:07 PM

Quote:

Originally Posted by markpetrakis

It looks like you might have welded shut the small pipe in the hemholtz chamber?? Is that normally an open pipe or just a small off shoot to reduce sound?

The pics from above are not mine .
I've done the "2 big pipe replacement" in the absorption chambers (middle-sections 5-6) => https://www.m3post.com/forums/showthread.php?t=733817

The mod. in the Helmholtz chamber 1-2 is the straight through mod. (ACM-mod)
ACM is louder , and will drone . Because the Helmholtz chambers are deleted by the straight through pipes 3-4 .

1-Drawing to look inside ..
2-Pic below shows the ACM mod.

timothy2001 · 05-28-2020, 05:09 AM

One of the easiest and least expensive exhaust mods that sounds great.

05-20-2020, 06:07 PM	#1
markpetrakis Private 16 Rep 58 Posts Drives: 2011 BMW M3 Join Date: Jul 2017 Location: California iTrader: (0)	OEM Exhaust Mod Ok, so here’s the deal... I already have my flame suit on just in case. I searched like crazy and was not able to find a single picture of it, but I’m hoping someone has a photo of the stock muffler with the whole thing open??? Every single one I’ve found is either the inside portion open for a perforated mod or the outer portion for the straight through, but I have not been able to find one that shows both being open. Anyone have one or can point me in the right direction? Thank you and flame away
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05-28-2020, 05:09 AM	#7
timothy2001 Major 850 Rep 1,181 Posts Drives: 2011 E92 M3 6MT ZCP Join Date: Oct 2014 Location: NE Florida iTrader: (0) Garage List 2011 M3 E92 [0.00]	One of the easiest and least expensive exhaust mods that sounds great.
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