Muffler delete question please!

speedfan · 10-05-2011, 08:17 AM

Hi everyone,
if I delete the muffler of the mid pipes, but keep the rear muffler, would I lose back pressure & lose a lot of horsepower?

Thanks,
D

dangeris · 11-09-2011, 11:49 AM

There is no muffler on the mid-pipe. Mufflers are located at the rear or before the tail pipe. Are you reperrinf to the the resonator?

benzo23 · 11-09-2011, 11:57 AM

He has to be talking about the resonator, ive heard from many members that deleting the resonator and keeping the stock muffler gains nothing on performance or on sound.

N0OS3 · 11-09-2011, 12:00 PM

Resonator won't do anything for performance... you may get a higher tone of exhaust but not really any louder.

If you do take the muffler off, you will move your RPM range down a lot... ex: normally you cruise at 70mph at 2000-2300 rpm... taking the muffler off will reduce back pressure and you will then cruise 70mph at 2700-3000 rpm.

^^this is my personal experience... you will lose gas mileage if you cruise anywhere above 65mph, it sucks but it's reality.

Gavin@MMW · 11-09-2011, 12:09 PM

With your Race muffler - it will be louder and will also add some "gurrgle" or pop on a downshift.

Route 16 · 11-09-2011, 12:48 PM

On a stock exhaust example, resonator is the subway sandwich looking thing, and cats are the bulbs?

N0OS3 · 11-09-2011, 01:17 PM

Quote:

Originally Posted by yoko kai

On a stock exhaust example, resonator is the subway sandwich looking thing, and cats are the bulbs?

O_o why did you get your whole exhaust unbolted (just curious)...

and the answer to your question, yes... the 'bulbs' are the secondary catalytic converters. The primaries are in the exhaust headers.

Route 16 · 11-09-2011, 01:21 PM

Quote:

Originally Posted by lync9763

O_o why did you get your whole exhaust unbolted (just curious)...

and the answer to your question, yes... the 'bulbs' are the secondary catalytic converters. The primaries are in the exhaust headers.

I wanted to make bullets for the upcoming zombie attack! nah jk I put a full eisenmann on.

http://www.e90post.com/forums/showthread.php?t=608932

benzo23 · 11-09-2011, 01:29 PM

Cut that stock muffler open and lets see what the internals are so we can make our own PE lol

Gavin@MMW · 11-09-2011, 01:45 PM

Quote:

Originally Posted by yoko kai

On a stock exhaust example, resonator is the subway sandwich looking thing, and cats are the bulbs?

Has to be a single guy, no wife would allow an exhaust in the front yard haha

Route 16 · 11-09-2011, 02:01 PM

Quote:

Originally Posted by benzo23

Cut that stock muffler open and lets see what the internals are so we can make our own PE lol

That'll be sweet, if anyone in the Bay Area notices, maybe it can happen!

Quote:

Originally Posted by Gavin@MMW

Has to be a single guy, no wife would allow an exhaust in the front yard haha

Haha nope, I have a wife and kid, I don't think she's noticed that it's in the front yard yet haha. She always parks in the garage. I left it out so I can clean it up and hide it in the garage.

berserkerx · 11-10-2011, 05:31 AM

I am guessing that system weighs like a million pounds huh? Haha I have heard our rear muffler alone is 40 lbs which is just stupid!!!

The RPM vs speed would seriously change that badly to move your cruising range up that much??!!

dangeris · 11-10-2011, 11:55 AM

Quote:

Originally Posted by Gavin@MMW

Has to be a single guy, no wife would allow an exhaust in the front yard haha

Tru dat!!

speedfan · 11-11-2011, 05:03 AM

Hi everyone,
Thanks for correcting me about the resonator.

Dark_Knight_335 · 11-14-2011, 06:42 AM

Quote:

Originally Posted by yoko kai

Haha nope, I have a wife and kid, I don't think she's noticed that it's in the front yard yet haha. She always parks in the garage. I left it out so I can clean it up and hide it in the garage.

DYNASTY XSV · 11-14-2011, 09:25 AM

Quote:

Originally Posted by lync9763

Resonator won't do anything for performance... you may get a higher tone of exhaust but not really any louder.

If you do take the muffler off, you will move your RPM range down a lot... ex: normally you cruise at 70mph at 2000-2300 rpm... taking the muffler off will reduce back pressure and you will then cruise 70mph at 2700-3000 rpm.

^^this is my personal experience... you will lose gas mileage if you cruise anywhere above 65mph, it sucks but it's reality.

i dont know what your talking about

i deleted my muffler and i definitely havent lost gas mileage, still averaging like 23 mpg are you AT or MT

shazzy04 · 11-14-2011, 10:51 AM

Quote:

Originally Posted by DYNASTY XSV

i dont know what your talking about

i deleted my muffler and i definitely havent lost gas mileage, still averaging like 23 mpg are you AT or MT

AllydNYC · 11-14-2011, 09:05 PM

Quote:

Originally Posted by lync9763

Resonator won't do anything for performance... you may get a higher tone of exhaust but not really any louder.

If you do take the muffler off, you will move your RPM range down a lot... ex: normally you cruise at 70mph at 2000-2300 rpm... taking the muffler off will reduce back pressure and you will then cruise 70mph at 2700-3000 rpm.

^^this is my personal experience... you will lose gas mileage if you cruise anywhere above 65mph, it sucks but it's reality.

I'm at 2500 RPMS at 70 MPH. I do have a muffler delete.

Quote:

Originally Posted by DYNASTY XSV

i dont know what your talking about

i deleted my muffler and i definitely havent lost gas mileage, still averaging like 23 mpg are you AT or MT

Maybe it was the sound of the delete that made him give it more gas while driving?

10-05-2011, 08:17 AM	#1
speedfan Major 141 Rep 1,108 Posts Drives: BMW Join Date: Dec 2010 Location: HCM City iTrader: (2)	Muffler delete question please! Hi everyone, if I delete the muffler of the mid pipes, but keep the rear muffler, would I lose back pressure & lose a lot of horsepower? Thanks, D __________________ My e90 Frozen Grey. Dry CF Roof. Vorsteiner Double Sided CF Boot Lid. OSS. BMW Performance Aero Kit. BMW Performance CF Diffuser Cover. BMW Performance CF Trim. Robson Design Steering Wheel. Advan RS. Michelin PSS. H&R Touring Cup Kit. BMW Performance Brakes. Eisenmann Race Rear Muffler. ESS Directflash
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11-09-2011, 11:49 AM	#2
dangeris Second Lieutenant 22 Rep 221 Posts Drives: 08 e92 328xi Join Date: Aug 2011 Location: Chalfont Pa iTrader: (3)	There is no muffler on the mid-pipe. Mufflers are located at the rear or before the tail pipe. Are you reperrinf to the the resonator? __________________ 2008 e92 328Xi - Daily Driver M-Tech Lip/ M-side Skirts/ Painted Grille/ 18" LM Reps/ BMS Powerbox/ Koni Sport/ B&G S2 Springs 2008 997.1 TT Porsche; 2008 Nissan Altima Coupe - Show Car; 1995 300ZX SMZ #36
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11-09-2011, 11:57 AM	#3
benzo23 Colonel 74 Rep 2,848 Posts Drives: 14 F30 AW MSport Join Date: Apr 2010 Location: FL iTrader: (1)	He has to be talking about the resonator, ive heard from many members that deleting the resonator and keeping the stock muffler gains nothing on performance or on sound.
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11-09-2011, 12:00 PM	#4
N0OS3 Colonel 141 Rep 2,217 Posts Drives: E90 Join Date: Feb 2010 Location: Oak Harbor, WA iTrader: (5)	Resonator won't do anything for performance... you may get a higher tone of exhaust but not really any louder. If you do take the muffler off, you will move your RPM range down a lot... ex: normally you cruise at 70mph at 2000-2300 rpm... taking the muffler off will reduce back pressure and you will then cruise 70mph at 2700-3000 rpm. ^^this is my personal experience... you will lose gas mileage if you cruise anywhere above 65mph, it sucks but it's reality.
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11-09-2011, 12:09 PM	#5
Gavin@MMW Brigadier General 406 Rep 3,879 Posts Drives: MMW Supercharged E90 328i Join Date: Nov 2009 Location: 818/805 iTrader: (18)	With your Race muffler - it will be louder and will also add some "gurrgle" or pop on a downshift.
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11-09-2011, 12:48 PM	#6
Route 16 I got lei'd 844 Rep 7,593 Posts Drives: '10 E90 M3 Join Date: Sep 2011 Location: Dark Side of the Moon iTrader: (62)	On a stock exhaust example, resonator is the subway sandwich looking thing, and cats are the bulbs? Attached Images
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11-09-2011, 01:29 PM	#9
benzo23 Colonel 74 Rep 2,848 Posts Drives: 14 F30 AW MSport Join Date: Apr 2010 Location: FL iTrader: (1)	Cut that stock muffler open and lets see what the internals are so we can make our own PE lol
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11-10-2011, 05:31 AM	#12
berserkerx Private First Class 8 Rep 164 Posts Drives: 2006 330i Join Date: Jan 2011 Location: Utah iTrader: (0)	I am guessing that system weighs like a million pounds huh? Haha I have heard our rear muffler alone is 40 lbs which is just stupid!!! The RPM vs speed would seriously change that badly to move your cruising range up that much??!!
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11-11-2011, 05:03 AM	#14
speedfan Major 141 Rep 1,108 Posts Drives: BMW Join Date: Dec 2010 Location: HCM City iTrader: (2)	Hi everyone, Thanks for correcting me about the resonator. __________________ My e90 Frozen Grey. Dry CF Roof. Vorsteiner Double Sided CF Boot Lid. OSS. BMW Performance Aero Kit. BMW Performance CF Diffuser Cover. BMW Performance CF Trim. Robson Design Steering Wheel. Advan RS. Michelin PSS. H&R Touring Cup Kit. BMW Performance Brakes. Eisenmann Race Rear Muffler. ESS Directflash
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