Stock F30 335i Axle Back Exhaust Muffler Modification and Dissection

Suave · 03-25-2014, 07:41 PM

nice work!

Falafel Combo · 03-25-2014, 07:51 PM

Love the stock exhaust! I'm dragging my feet to put on the MPE.

Falafel Combo · 03-25-2014, 07:54 PM

Just curious, has anyone dissected the MPE? How do the insides compare with stock?

Jadar · 03-25-2014, 08:20 PM

Quote:

Originally Posted by alpinweiss 335i

Just curious, has anyone dissected the MPE? How do the insides compare with stock?

Not yet, I'm going to this spring or whenever it warms up.

skunkd · 03-26-2014, 07:59 AM

I am not understanding the point of this. Why not just cut off the muffler and replace with straight piping and use the factory tips with actuator. Would be way easier and end up sounding the same and on top of that is reversible.

n55x3 · 03-26-2014, 08:56 AM

Quote:

Originally Posted by skunkd

I am not understanding the point of this. Why not just cut off the muffler and replace with straight piping and use the factory tips with actuator. Would be way easier and end up sounding the same and on top of that is reversible.

If you do that you have potential for massive drone as you are eliminating the hemholz chamber.

skunkd · 03-26-2014, 10:52 AM

Quote:

Originally Posted by n55x3

If you do that you have potential for massive drone as you are eliminating the hemholz chamber.

I'm sorry but that is just plain wrong... This does nothing to save you from any excess drone. It would be the same as a muffler delete. The Helmholtz chamber isn't doing anything if the perforated sections are welded shut...

It needs an entrance to function and there is none. The resonance in the pipes is traveling right through out the rear of the exhaust the muffler is completely bypassed the way this is setup resulting in the same exact thing as if the muffler was just deleted completely.

FreddyG · 03-26-2014, 11:06 AM

Quote:

Originally Posted by skunkd

I'm sorry but that is just plain wrong... This does nothing to save you from any excess drone. It would be the same as a muffler delete. The Helmholtz chamber isn't doing anything if the perforated sections are welded shut...

It needs an entrance to function and there is none. The resonance in the pipes is traveling right through out the rear of the exhaust the muffler is completely bypassed the way this is setup resulting in the same exact thing as if the muffler was just deleted completely.

Please try it then and let us know if it drones.

skunkd · 03-26-2014, 11:13 AM

Quote:

Originally Posted by FreddyG

Please try it then and let us know if it drones.

They reason I say it is because I have tried it in my past 3 bmw's no drone as long as you don't screw around with any resonators/h or x-pipes in place, deleting a muffler won't add drone. This whole process just seems excessive and not reversible (not sure why anyone would want to reverse it though).

Jadar · 03-26-2014, 12:23 PM

Quote:

Originally Posted by skunkd

Quote:

Originally Posted by n55x3

If you do that you have potential for massive drone as you are eliminating the hemholz chamber.

I'm sorry but that is just plain wrong... This does nothing to save you from any excess drone. It would be the same as a muffler delete. The Helmholtz chamber isn't doing anything if the perforated sections are welded shut...

It needs an entrance to function and there is none. The resonance in the pipes is traveling right through out the rear of the exhaust the muffler is completely bypassed the way this is setup resulting in the same exact thing as if the muffler was just deleted completely.

Look at the 1st post and pics very carefully. The perforated tubes are designed in excess to let some sound escape nothing to do with drone. When you weld them shut is where you pick up the louder sound.

Now look at the 2nd smaller hole in chamber 3. It leads into the Helmholtz chamber and it's what reduces drone drastically. DO NOT PLUG THIS HOLE. Or essentially it is just like straight pipes.

What's the point if this? Well for one it's cheaper then what you're talking about with just hacking off the muffler and straight piping it. You retain the stock muffler. Looks better and CLEANER. It's about 20% louder then a M performance muffler so it's just right and not obnoxious.

I mean do what you think is right for you, no one is making you do it.

skunkd · 03-26-2014, 01:45 PM

Quote:

Originally Posted by dd1981

Look at the 1st post and pics very carefully. The perforated tubes are designed in excess to let some sound escape nothing to do with drone. When you weld them shut is where you pick up the louder sound.

Now look at the 2nd smaller hole in chamber 3. It leads into the Helmholtz chamber and it's what reduces drone drastically. DO NOT PLUG THIS HOLE. Or essentially it is just like straight pipes.

What's the point if this? Well for one it's cheaper then what you're talking about with just hacking off the muffler and straight piping it. You retain the stock muffler. Looks better and CLEANER. It's about 20% louder then a M performance muffler so it's just right and not obnoxious.

I mean do what you think is right for you, no one is making you do it.

From "chamber 1" you mean right? I see that now if thats what your talking about.

TurboM · 03-26-2014, 02:34 PM

Quote:

Originally Posted by skunkd

From "chamber 1" you mean right? I see that now if thats what your talking about.

Yes, chamber 1 is what he was referring to.

Side note: I had to take a drive around the block to pick something up after I cut the muffler off and trust me, there is a VERY big difference between this method and running straight pipes. Under light throttle you barely hear the exhaust note, which is far from possible with straight pipes.

Jadar · 03-26-2014, 02:58 PM

Quote:

Originally Posted by skunkd

From "chamber 1" you mean right? I see that now if thats what your talking about.

Yes sorry from left to right is 1-3. That's exactly the pipe I was referring to. I know it was hard to see from my original photos.

skunkd · 03-26-2014, 03:02 PM

got it, thanks for the clarification I can see it being functional then.

Jadar · 03-26-2014, 03:08 PM

Quote:

Originally Posted by skunkd

From "chamber 1" you mean right? I see that now if thats what your talking about.

Quote:

Originally Posted by TurboM

Yes, chamber 1 is what he was referring to.

Side note: I had to take a drive around the block to pick something up after I cut the muffler off and trust me, there is a VERY big difference between this method and running straight pipes. Under light throttle you barely hear the exhaust note, which is far from possible with straight pipes.

1st hand experience

. This man speaks the truth.

Jadar · 03-26-2014, 03:09 PM

Quote:

Originally Posted by skunkd

got it, thanks for the clarification I can see it being functional then.

not a problem buddy

Dog Face Pony Soldier · 03-26-2014, 09:25 PM

Anybody try only welding shut the holes on the driver's side (US) and keep the external valve functional?

Hernandiaz11 · 03-27-2014, 02:08 PM

Currently trying to find an stock 435i or F30 335i muffler to do this mod.

carzaddict · 04-01-2014, 02:47 PM

awesome write up! you're a brave soul.

one of the Infiniti guys did this to his G37 exhaust (imo one of the best sounding entry level V6 engine exhausts).....very similar set up with an additional tube going from canister 1 into 3...i wonder if thats what creates a nice growl sound.

flinchy · 04-05-2014, 08:17 AM

oh wow didn't see the extra tube going into the haimholtz, clever!

it's like straight pipes but with a resonator, not bad.

DG20 · 01-20-2015, 01:53 AM

Can this be done at a muffler shop? If so, what should I tell them to do? Thanks.

geoff7877 · 03-22-2015, 11:02 AM

Anyone try this on a stock 328i/428i muffler? I had considered getting the 428i MPE but no way with that price tag. I've considered other options but there's such an unknown factor with the final outcome. I don't want to drop $500 plus for a muffler but I'd love to get a better sound.

Thanks and great write up and videos!

03-25-2014, 07:41 PM	#111
Suave Major 287 Rep 1,449 Posts Drives: GT4 and M2 in progress Join Date: Aug 2013 Location: Philadelphia, PA iTrader: (0)	nice work!
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03-25-2014, 07:51 PM	#112
Falafel Combo Banned 3773 Rep 6,673 Posts Drives: X5 xDrive50i Join Date: May 2011 Location: New England iTrader: (3)	Love the stock exhaust! I'm dragging my feet to put on the MPE.
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03-25-2014, 07:54 PM	#113
Falafel Combo Banned 3773 Rep 6,673 Posts Drives: X5 xDrive50i Join Date: May 2011 Location: New England iTrader: (3)	Just curious, has anyone dissected the MPE? How do the insides compare with stock?
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03-26-2014, 07:59 AM	#115
skunkd Second Lieutenant 18 Rep 266 Posts Drives: 2004 STI 2008 BMW M5 2004 530i Join Date: Sep 2008 Location: NY iTrader: (0)	I am not understanding the point of this. Why not just cut off the muffler and replace with straight piping and use the factory tips with actuator. Would be way easier and end up sounding the same and on top of that is reversible.
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03-26-2014, 03:02 PM	#124
skunkd Second Lieutenant 18 Rep 266 Posts Drives: 2004 STI 2008 BMW M5 2004 530i Join Date: Sep 2008 Location: NY iTrader: (0)	got it, thanks for the clarification I can see it being functional then.
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03-26-2014, 09:25 PM	#127
Dog Face Pony Soldier 2006 TIME Person Of The Year 9720 Rep 6,445 Posts Drives: M Sport 335i Join Date: May 2013 Location: North Jersey iTrader: (0) Garage List 2014 335i [9.74]	Anybody try only welding shut the holes on the driver's side (US) and keep the external valve functional? __________________
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03-27-2014, 02:08 PM	#128
Hernandiaz11 Banned 56 Rep 278 Posts Drives: 2014 435i M-Sport 6-Speed Join Date: Jun 2013 Location: Michigan iTrader: (3)	Currently trying to find an stock 435i or F30 335i muffler to do this mod.
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04-01-2014, 02:47 PM	#129
carzaddict Lieutenant Colonel 158 Rep 1,573 Posts Drives: 2015 Cadillac Escalade ESV Join Date: Aug 2013 Location: NJ iTrader: (0)	awesome write up! you're a brave soul. one of the Infiniti guys did this to his G37 exhaust (imo one of the best sounding entry level V6 engine exhausts).....very similar set up with an additional tube going from canister 1 into 3...i wonder if thats what creates a nice growl sound. __________________ 2015i Cadillac Escalade ESV
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04-05-2014, 08:17 AM	#130
flinchy Brigadier General 126 Rep 3,099 Posts Drives: E82 135i Join Date: Nov 2011 Location: QLD, Australia iTrader: (0)	oh wow didn't see the extra tube going into the haimholtz, clever! it's like straight pipes but with a resonator, not bad.
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01-20-2015, 01:53 AM	#131
DG20 Lieutenant Colonel 967 Rep 1,771 Posts Drives: M340i Join Date: May 2014 Location: Los Angeles, CA iTrader: (5)	Can this be done at a muffler shop? If so, what should I tell them to do? Thanks.
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03-22-2015, 11:02 AM	#132
geoff7877 Private First Class 18 Rep 98 Posts Drives: 428i M Sport 6MT Join Date: Jan 2015 Location: Northern CA iTrader: (0)	Anyone try this on a stock 328i/428i muffler? I had considered getting the 428i MPE but no way with that price tag. I've considered other options but there's such an unknown factor with the final outcome. I don't want to drop $500 plus for a muffler but I'd love to get a better sound. Thanks and great write up and videos!
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