Modify OEM exhaust to sound like PE exhaust

kiteboy · 09-25-2013, 06:08 PM

i put my bmw performance exhaust today and very beautiful sound !!

psmitty95 · 09-25-2013, 07:33 PM

Quote:

Originally Posted by 805beemer

Here you go! Mind you this was just taken with my cell phone so sound quality isn't the best. If you want any other vids just let me know.

Holy shit that sounds amazing. I can't wait how mine sounds with catless DP, and secondary cat delete but stock e90 res.

daMau · 09-25-2013, 11:13 PM

So what is the consensus on modding E90 mufflers? I have catless DPs, secondary cats and stock resonator, looking for a good sound for a daily driver.

Remove all packing? Cover passenger side perforation? This thread is all over the place and I am no exhaust expert

StevenY. · 09-25-2013, 11:17 PM

Quote:

Originally Posted by dMau1986

So what is the consensus on modding E90 mufflers? I have catless DPs, secondary cats and stock resonator, looking for a good sound for a daily driver.

Remove all packing? Cover passenger side perforation? This thread is all over the place and I am no exhaust expert

Generally sounds like removing packing alone is enough.

I don't know if you guys with stock e92 335i exhausts have noticed but if you listen closely, when you decel you can actually hear a bit of burbling so I'm guessing maybe removing packing alone is enough.

psmitty95 · 09-26-2013, 08:27 PM

Don't know if this helps you guys or if anyone has opened up IS mufflers. It looks like straight through piping not perforated to me.

LoneRanger24 · 09-26-2013, 08:50 PM

Nice . Any input on the connecting tubing ?

914kid · 09-26-2013, 09:33 PM

So you are you guys JUST removing the packing or are you also removing the perforated pipe inside the muffler and replacing it with another one? And 50% packing from both, or all the packing from both?

I am very confused and want to get this in a few weeks, I am going to be ordering cyba tips very soon and my friend is giving me his mufflers from his 335 since he had the muffler delete done.

psmitty95 · 09-26-2013, 10:06 PM

Quote:

Originally Posted by LoneRanger24

Nice . Any input on the connecting tubing ?

I don't want to cut mine so no idea but from what I could see it branched off and wasn't just straight through to the tips. Looks like a few pipes going on inside the muffler and from angels I looked at looked all straight to me. My guess is maybe the IS is normal E9x muffler but with straight pipes and all packing still left inside?

dlbrooks18 · 09-27-2013, 12:00 AM

I long for the day when someone with a PE just cuts it open and finally we will know, Lol.

dlbrooks18 · 09-27-2013, 12:01 AM

Quote:

Originally Posted by StevenY.

Generally sounds like removing packing alone is enough.

I don't know if you guys with stock e92 335i exhausts have noticed but if you listen closely, when you decel you can actually hear a bit of burbling so I'm guessing maybe removing packing alone is enough.

My thoughts too..

914kid · 09-27-2013, 12:02 AM

Quote:

Originally Posted by psmitty95

I don't want to cut mine so no idea but from what I could see it branched off and wasn't just straight through to the tips. Looks like a few pipes going on inside the muffler and from angels I looked at looked all straight to me. My guess is maybe the IS is normal E9x muffler but with straight pipes and all packing still left inside?

Where did you pick up the 335is mufflers from? If you dont mind me asking how much did you pay?

psmitty95 · 09-27-2013, 11:18 AM

Quote:

Originally Posted by 914kid

Quote:

Originally Posted by psmitty95

I don't want to cut mine so no idea but from what I could see it branched off and wasn't just straight through to the tips. Looks like a few pipes going on inside the muffler and from angels I looked at looked all straight to me. My guess is maybe the IS is normal E9x muffler but with straight pipes and all packing still left inside?

Where did you pick up the 335is mufflers from? If you dont mind me asking how much did you pay?

Bought it used from a guy on here with around 3k miles. It cost me around $450 shipped

dlbrooks18 · 09-28-2013, 11:49 AM

Quote:

Originally Posted by bwco

Indeed, the PE does have packing in it.

How do you know?

tturbolife · 09-28-2013, 10:36 PM

So I removed all the packing from both sides (my 335i e92 does have it on both sides) and it is a little bit louder. I couldn't really hear the exhaust from inside the car before but now I can. It isn't super loud but you can hear it. It sounds pretty nice from outside.

If I were to do it again, I probably would have also replaced the pipes with straight pipes to get it louder

and keep in mind, these exhausts are stainless steel, so you need to have someone with the experience and tools to weld stainless.

dlbrooks18 · 09-28-2013, 10:50 PM

Quote:

Originally Posted by derekwilkinson

So I removed all the packing from both sides (my 335i e92 does have it on both sides) and it is a little bit louder. I couldn't really hear the exhaust from inside the car before but now I can. It isn't super loud but you can hear it. It sounds pretty nice from outside.

If I were to do it again, I probably would have also replaced the pipes with straight pipes to get it louder

and keep in mind, these exhausts are stainless steel, so you need to have someone with the experience and tools to weld stainless.

How much did it cost to do? Do you have downpipes if not that would make it louder. Thanks.

tturbolife · 09-28-2013, 11:04 PM

Quote:

Originally Posted by dlbrooks18

How much did it cost to do? Do you have downpipes if not that would make it louder. Thanks.

$200

No I don't have downpipes yet

914kid · 09-28-2013, 11:10 PM

Quote:

Originally Posted by derekwilkinson

$200

No I don't have downpipes yet

Wow $200 just to cut open the muffler and remove the packing? What do you mean shop needs to know stainless steel welding, shouldn't ALL exhaust shops know that?

tturbolife · 09-28-2013, 11:13 PM

Quote:

Originally Posted by 914kid

Wow $200 just to cut open the muffler and remove the packing? What do you mean shop needs to know stainless steel welding, shouldn't ALL exhaust shops know that?

There are different gas mixtures you can use for stainless steel welding... so pretty much any shop can do it, the quality of the work will depend on the gas mixture they use.

bwco · 09-29-2013, 12:03 AM

Quote:

Originally Posted by dlbrooks18

Quote:

Originally Posted by bwco

Indeed, the PE does have packing in it.

How do you know?

Because I have the PE and a probe plus it's easier to know when you soak the PE with water, then shake it !

This thread has lots of misinformed information !

secretsquirrel · 09-29-2013, 12:48 AM

Quote:

Originally Posted by bwco

Because I have the PE and a probe plus it's easier to know when you soak the PE with water, then shake it !

This thread has lots of misinformed information !

Well, please inform us! We've all be speculating because of lack of solid information. Give us a bone!

LoneRanger24 · 09-29-2013, 01:54 AM

If you really sit down and think about it how does oem exhaust work????

When the flap is closed the there is back pressure created through the mid pipe and allows more free flow through the passenger side muffler which is a opened perforated muffler with packing apposed to the drivers side with the perforated insulated small resonator. When the flap is open flow is allowed to go through the drivers side muffler with the small perforated resonator that's why it's much louder with the " exhaust mod/ golf tee"

My bet is the PE /is mufflers have two small resonator type on both sides with solid pipes. I would put money on it but what do I know I'm just an engineer . Cheers.

914kid · 09-29-2013, 03:09 AM

So I read a few threads for the last 2-3 hours lol, so here is what I have gathered.

Removing the packing 75-100% yields "slightly" louder than stock but nothing much more.

Removing the packing 75-100% and replacing all the perforated piping with stainless steel piping makes it sound much louder and somewhat similar to PE?

BMW 335is mufflers have less packing and stainless piping from what someone saw through a probe?

My question is what about removing the packing 75-100% and WRAPPING the perforated piping? Wouldn't this be cheaper and more cost effective, how do you wrap exhaust parts anyway?

09-25-2013, 06:08 PM	#463
kiteboy Lieutenant 13 Rep 423 Posts Drives: E92 Stage 2 BR Performance Join Date: Apr 2010 Location: France iTrader: (0)	i put my bmw performance exhaust today and very beautiful sound !! __________________ 335i Pack M Stage 2 BR Performance 403,5 hp 582n.m/Bilstein B14 pss/R&B PVC2 valve/K&N air filter/Spearco FMIC/pre cata empty/EBC Redstuff,aviation hose, BMW Performance exhaust, Charge pipe Evolution Racewerks, Forge DVs
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09-25-2013, 11:13 PM	#465
daMau Second Lieutenant 45 Rep 238 Posts Drives: F80 M3 Join Date: Dec 2010 Location: Minneapolis, MN iTrader: (0)	So what is the consensus on modding E90 mufflers? I have catless DPs, secondary cats and stock resonator, looking for a good sound for a daily driver. Remove all packing? Cover passenger side perforation? This thread is all over the place and I am no exhaust expert
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09-26-2013, 08:27 PM	#467
psmitty95 Brigadier General 593 Rep 4,393 Posts Drives: '23 M340i xDrive Join Date: Jan 2012 Location: Boston, MA iTrader: (11)	Don't know if this helps you guys or if anyone has opened up IS mufflers. It looks like straight through piping not perforated to me. __________________ < Click picture for photoshoot E90 335i xDrive 6spd, Nav, Prem, Cold Weather, & Sports package - Msport Conversion Mods: JB4 + MHD, Doc Race ST, Pure 6266, AD-Eng PI/Mounts, Fuel-It st. 3, Custom Exhaust, Tuned by TwistedTuning More Pictures: Build Thread /// 683AWHP/675AWTQ
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09-26-2013, 08:50 PM	#468
LoneRanger24 Private 0 Rep 56 Posts Drives: 335i Join Date: Jan 2012 Location: DFW iTrader: (0)	Nice . Any input on the connecting tubing ?
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09-26-2013, 09:33 PM	#469
914kid Banned 28 Rep 363 Posts Drives: E90 335xi Join Date: Jun 2013 Location: Pelham, NY iTrader: (1)	So you are you guys JUST removing the packing or are you also removing the perforated pipe inside the muffler and replacing it with another one? And 50% packing from both, or all the packing from both? I am very confused and want to get this in a few weeks, I am going to be ordering cyba tips very soon and my friend is giving me his mufflers from his 335 since he had the muffler delete done.
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09-27-2013, 12:00 AM	#471
dlbrooks18 Brigadier General 164 Rep 3,735 Posts Drives: e90 335i Join Date: Nov 2008 Location: Los Angeles iTrader: (2)	I long for the day when someone with a PE just cuts it open and finally we will know, Lol. __________________ 2008 E90 335
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09-28-2013, 10:36 PM	#476
tturbolife Major 246 Rep 1,037 Posts Drives: None Join Date: May 2013 Location: USA iTrader: (1) Garage List 2020 BMW M340i [0.00]	So I removed all the packing from both sides (my 335i e92 does have it on both sides) and it is a little bit louder. I couldn't really hear the exhaust from inside the car before but now I can. It isn't super loud but you can hear it. It sounds pretty nice from outside. If I were to do it again, I probably would have also replaced the pipes with straight pipes to get it louder and keep in mind, these exhausts are stainless steel, so you need to have someone with the experience and tools to weld stainless. __________________ M340i: Arctic White, 790M wheels, Cognac interior, Aluminum Tetragon trim - Totaled
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09-29-2013, 01:54 AM	#483
LoneRanger24 Private 0 Rep 56 Posts Drives: 335i Join Date: Jan 2012 Location: DFW iTrader: (0)	If you really sit down and think about it how does oem exhaust work???? When the flap is closed the there is back pressure created through the mid pipe and allows more free flow through the passenger side muffler which is a opened perforated muffler with packing apposed to the drivers side with the perforated insulated small resonator. When the flap is open flow is allowed to go through the drivers side muffler with the small perforated resonator that's why it's much louder with the " exhaust mod/ golf tee" My bet is the PE /is mufflers have two small resonator type on both sides with solid pipes. I would put money on it but what do I know I'm just an engineer . Cheers.
	Appreciate 0 Quote

09-29-2013, 03:09 AM	#484
914kid Banned 28 Rep 363 Posts Drives: E90 335xi Join Date: Jun 2013 Location: Pelham, NY iTrader: (1)	So I read a few threads for the last 2-3 hours lol, so here is what I have gathered. Removing the packing 75-100% yields "slightly" louder than stock but nothing much more. Removing the packing 75-100% and replacing all the perforated piping with stainless steel piping makes it sound much louder and somewhat similar to PE? BMW 335is mufflers have less packing and stainless piping from what someone saw through a probe? My question is what about removing the packing 75-100% and WRAPPING the perforated piping? Wouldn't this be cheaper and more cost effective, how do you wrap exhaust parts anyway?
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