OEM Exhaust Mod on 2011 e93 M3

smithl3 · 01-02-2021, 07:19 PM

After reading all the rave reviews and hearing the difference, I decided to pull the plug and modify mine.

Used a regular cordless grinder with 4.5" diameter and .040" thick cutoff wheel to open up the upper section. Was a little awkward with the sawzall to cut the interior sections of perforated pipe, but it worked fine.

I ended up buying a 120v welder and doing it myself to justify a new tool purchase. Took about an hour to get the exhaust out, 4 hours to modify and another hour to get back in. I had a local shop cut some 2.5" pipe and flare one end to slide over the existing sections in the muffler. Each piece of pipe ended up being about 5.5" long.

Unfortunately the car is on a lift for the winter, so I don't have more video of the sound, but so far it sounds amazing... can't wait till spring to hear it on the open road.

SCREAM3R · 01-02-2021, 07:30 PM

Nice! I had reservations about doing mine but damn near being free it sounds awesome.

///M Power-Belgium · 01-02-2021, 07:43 PM

Great job . Well performed

Still love mine ..

serranot · 01-03-2021, 06:50 AM

It's a great mod. I've had mine for years now. Still a great balance between great sound and noise.

Helmsman · 01-05-2021, 01:15 AM

Love the flared pipes idea. Obvious once seeing it but nothing my shop did when modding my back box.

SAMM3Y · 01-05-2021, 01:26 AM

Nice! An expensive tool purchase justified by a cheap stocker exhaust mod is definitely a post I can get behind! Looks great... now you'll be hunting for more welding projects...

Helmsman · 01-05-2021, 04:33 AM

Quote:

Originally Posted by SAMM3Y

Nice! An expensive tool purchase justified by a cheap stocker exhaust mod is definitely a post I can get behind! Looks great... now you'll be hunting for more welding projects...

It is nice isn't it! I started to collect various nice tools since I started to do some of the work myself a couple of years ago. First 5 years I went to the dealer even of the oil changes. Doing fluids, plugs, TA's, thermostat etc since has been a very nice next level of the ownership. And even with some new tools for every job I save money on top...

And this forum always provide missing guidelines!

L4ces · 01-12-2021, 07:50 PM

Not let’s try those skills on an MPE. :-)

01-02-2021, 07:19 PM	#1
smithl3 New Member 12 Rep 11 Posts Drives: 2011 BMW M3 e93 Join Date: Dec 2020 Location: Upstate NY iTrader: (0)	After reading all the rave reviews and hearing the difference, I decided to pull the plug and modify mine. Used a regular cordless grinder with 4.5" diameter and .040" thick cutoff wheel to open up the upper section. Was a little awkward with the sawzall to cut the interior sections of perforated pipe, but it worked fine. I ended up buying a 120v welder and doing it myself to justify a new tool purchase. Took about an hour to get the exhaust out, 4 hours to modify and another hour to get back in. I had a local shop cut some 2.5" pipe and flare one end to slide over the existing sections in the muffler. Each piece of pipe ended up being about 5.5" long. Unfortunately the car is on a lift for the winter, so I don't have more video of the sound, but so far it sounds amazing... can't wait till spring to hear it on the open road. Attached Images
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01-02-2021, 07:30 PM	#2
SCREAM3R Private 65 Rep 60 Posts Drives: 2009 BMW M3 Join Date: Apr 2019 Location: California iTrader: (1)	Nice! I had reservations about doing mine but damn near being free it sounds awesome.
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01-02-2021, 07:43 PM	#3
///M Power-Belgium General 92184 Rep 31,411 Posts Drives: ///M3-E92-DCT Join Date: Jul 2012 Location: Belgium iTrader: (0)	Great job . Well performed Still love mine .. __________________ "MAX VERSTAPPEN" IS THE 2021+2022+2023+2024 F1 WORLD CHAMPION - #UnLeashTheLion - BPM DEV-Tune & DCT Software-Tune & Servotronic & coding ///Alpine HID Angeleyes ///Oem.exhaust mod.
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01-03-2021, 06:50 AM	#4
serranot Lieutenant 348 Rep 505 Posts Drives: Nothing Now Join Date: Mar 2011 Location: Middletown, MD iTrader: (0) Garage List 2011 BMW E90 M3 [10.00]	It's a great mod. I've had mine for years now. Still a great balance between great sound and noise.
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01-05-2021, 01:15 AM	#5
Helmsman Major General 5484 Rep 7,657 Posts Drives: 2011 AW E90 M3 ZCP Join Date: Mar 2014 Location: Stockholm, Sweden iTrader: (0)	Love the flared pipes idea. Obvious once seeing it but nothing my shop did when modding my back box.
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01-05-2021, 01:26 AM	#6
SAMM3Y Colonel 3110 Rep 2,747 Posts Drives: 2008 m3 Join Date: Feb 2018 Location: NorCal iTrader: (2)	Nice! An expensive tool purchase justified by a cheap stocker exhaust mod is definitely a post I can get behind! Looks great... now you'll be hunting for more welding projects... __________________ 9ers
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01-12-2021, 07:50 PM	#8
L4ces Major 362 Rep 1,492 Posts Drives: 2008 E92 M3 Alpine White Join Date: Aug 2010 Location: NJ - NY iTrader: (0) Garage List 2008 M3 [0.00]	Not let’s try those skills on an MPE. :-)
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