Call Me Picky

rottjr · 02-08-2014, 09:04 AM

I'm I being too picky to wonder why the M4 has quad exhaust pipes but only one muffler?

I'd think that a car costing close to 80k w/just a few options and sales tax would at least have dual mufflers.

If there's a good reason for having only one muffler please explain.

Black Gold · 02-08-2014, 09:06 AM

the e46, e92 and f8x have all had one muffler. for that matter, the MPE for the e9x also was a single muffler design.

not sure, but doesn't matter to me personally. probably the easiest design to create the sound and fitment they want.

jbockrd · 02-08-2014, 09:36 AM

I want 4 mufflers someone find the room under that rear end dammit JK

But seriously, why does that upset you. The sound and performance out of my e92 M is pretty damn good. It breathes and exhausts well for me

jstnstr · 02-08-2014, 09:46 AM

Is there any benefit two mufflers would have over one? Do you mean two in series or in parallel? Considering how the radius of a cylinder affects the resistance to flow (8Ln/pi(r)^4) a single larger diameter cylinder will allow larger flow than two smaller cylinders. So BMW is probably justified in having one larger rather than two small mufflers.

Nex · 02-08-2014, 09:54 AM

I have no idea how much the quad outlet mufflers weigh, but wouldn't putting two mufflers instead of the one be heavier?
Also, the extra y-piping that it would take to run the dual mufflers will surely be heavier.

karbonphiber · 02-08-2014, 10:04 AM

Quote:

Originally Posted by jbockrd;*****809

I want 4 mufflers someone find the room under that rear end dammit JK

I want 6 mufflers - one for each each engine cylinder

/// M sa · 02-08-2014, 10:08 AM

Muffler delete for the win

parky1215 · 02-08-2014, 10:13 AM

I do not mind it at all.

Sedan_Clan · 02-08-2014, 10:16 AM

This is a silly ass thread.

bruce.augenstein@comcast. · 02-08-2014, 10:25 AM

Quote:

Originally Posted by rottjr;*****711

I'm I being too picky to wonder why the M4 has quad exhaust pipes but only one muffler?

I'd think that a car costing close to 80k w/just a few options and sales tax would at least have dual mufflers.

If there's a good reason for having only one muffler please explain.

Rule of thumb: The more cylinders exiting into a muffler, the more efficient it can be using minimal baffling. As long as the muffler in question has enough volume to process the needed exhaust flow, you would expect slightly increased power compared to dual mufflers with the same overall combined flow capability.

Bruce

discoboy1 · 02-08-2014, 12:29 PM

Quote:

Originally Posted by rottjr;*****711

I'm I being too picky to wonder why the M4 has quad exhaust pipes but only one muffler?

I'd think that a car costing close to 80k w/just a few options and sales tax would at least have dual mufflers.

If there's a good reason for having only one muffler please explain.

How about weight reduction???

elitex · 02-08-2014, 01:50 PM

Quote:

Originally Posted by rottjr

I'm I being too picky to wonder why the M4 has quad exhaust pipes but only one muffler?

I'd think that a car costing close to 80k w/just a few options and sales tax would at least have dual mufflers.

If there's a good reason for having only one muffler please explain.

Yes, you are picky....

TheDeliverator · 02-08-2014, 03:24 PM

Yes, he\she's picky... not a bad thing

Lottsa of m3 owners are. Just depends what we're picky about.

For example: Plenty of e9x m owners hated how much the stock muffler hung down when viewed from the rear.

OP: One of the benefits of aftermarket... as long as you're prepared to pay the ///mTax

Needsdecaf · 02-08-2014, 04:14 PM

Quote:

Originally Posted by Sedan_Clan

This is a silly ass thread.

Yup.

///M5Bruno · 02-08-2014, 04:26 PM

Picky.

Boss330 · 02-08-2014, 04:47 PM

Quote:

Originally Posted by rottjr;*****711

I'm I being too picky to wonder why the M4 has quad exhaust pipes but only one muffler?

I'd think that a car costing close to 80k w/just a few options and sales tax would at least have dual mufflers.

If there's a good reason for having only one muffler please explain.

Seeing how much more expensive cars has one muffler, don't see any issue with the M3/4 either

Ferrari F430

SLS AMG

Aston Martin DBS

Audi R8

pkimM3r · 02-08-2014, 06:47 PM

Quote:

Originally Posted by Boss330

Quote:

Originally Posted by rottjr;*****711

I'm I being too picky to wonder why the M4 has quad exhaust pipes but only one muffler?

I'd think that a car costing close to 80k w/just a few options and sales tax would at least have dual mufflers.

If there's a good reason for having only one muffler please explain.

Seeing how much more expensive cars has one muffler, don't see any issue with the M3/4 either

Ferrari F430

SLS AMG

Aston Martin DBS

Audi R8

Those look way better haha

damnitBobby · 02-08-2014, 06:57 PM

back in the day i did a lot of reading on exhaust flow, back pressure, and how it affects power bands and throttle response etc..

To cut to the chase: having two mufflers does not always equate to more power, having larger diameter exhaust piping does not always equate to more power (but on FI applications bigger usually was better), incorporating an x-pipe in the exhaust flow usually resulted in a more desirable power band..

You're not picky, you're simply unaware.

ixse · 02-08-2014, 07:01 PM

^^ well put

Mr Tonka · 02-09-2014, 10:04 PM

2 mufflers. Sounds better, looks better, 1/2 the weight. And of course, not always the case.

I couldn't care less about it being 1 or 2 mufflers but for me the related factors had me choose a 2 muffler design; on my E46 and E92 M3s. The E46 was based on sound and the E92 was a combo of weight and sound. The much cleaner look was a substantial bonus on the E92.

Koldun · 02-09-2014, 10:30 PM

Quote:

Originally Posted by KennyPowers;*****714

the e46, e92 and f8x have all had one muffler. for that matter, the MPE for the e9x also was a single giant nutsack of a muffler design.

Fixed.

I went with the dual muffler design of Dinan. I like it.

02-08-2014, 09:04 AM	#1
rottjr Private First Class 28 Rep 109 Posts Drives: m4 Join Date: Jan 2014 Location: Northern Virginia iTrader: (0)	Call Me Picky I'm I being too picky to wonder why the M4 has quad exhaust pipes but only one muffler? I'd think that a car costing close to 80k w/just a few options and sales tax would at least have dual mufflers. If there's a good reason for having only one muffler please explain.
	Appreciate 0 Tweet Quote

02-08-2014, 09:06 AM	#2
Black Gold Major General 593 Rep 5,396 Posts Drives: M3 Join Date: Oct 2010 Location: Texas iTrader: (15)	the e46, e92 and f8x have all had one muffler. for that matter, the MPE for the e9x also was a single muffler design. not sure, but doesn't matter to me personally. probably the easiest design to create the sound and fitment they want. __________________
	Appreciate 0 Quote

02-08-2014, 09:36 AM	#3
jbockrd Lieutenant 23 Rep 550 Posts Drives: e92 Alpine White/Carbon M3 Join Date: Jul 2006 Location: Yardley, PA iTrader: (0)	I want 4 mufflers someone find the room under that rear end dammit JK But seriously, why does that upset you. The sound and performance out of my e92 M is pretty damn good. It breathes and exhausts well for me __________________ On the list for an M4!!
	Appreciate 0 Quote

02-08-2014, 09:46 AM	#4
jstnstr Lieutenant Colonel 928 Rep 1,496 Posts Drives: G20 M340xi Join Date: Apr 2012 Location: SWFL iTrader: (2)	Is there any benefit two mufflers would have over one? Do you mean two in series or in parallel? Considering how the radius of a cylinder affects the resistance to flow (8Ln/pi(r)^4) a single larger diameter cylinder will allow larger flow than two smaller cylinders. So BMW is probably justified in having one larger rather than two small mufflers. __________________ \| M-Performance Exhaust \| JB4 Map 4 on E35 \| BMC Red Panel Filter \| \| Previous: 18 M3 ZCP \| 17 M3 6MT \| 15 M235i \|
	Appreciate 0 Quote

02-08-2014, 09:54 AM	#5
Nex Second Lieutenant 22 Rep 290 Posts Drives: . Join Date: Aug 2013 Location: Toronto, Ontario, Canada iTrader: (0)	I have no idea how much the quad outlet mufflers weigh, but wouldn't putting two mufflers instead of the one be heavier? Also, the extra y-piping that it would take to run the dual mufflers will surely be heavier.
	Appreciate 0 Quote

02-08-2014, 10:08 AM	#7
/// M sa Major 242 Rep 1,418 Posts Drives: F80 MG Join Date: Jan 2014 Location: Delmarva iTrader: (0)	Muffler delete for the win
	Appreciate 0 Quote

02-08-2014, 10:13 AM	#8
parky1215 Lieutenant Colonel 573 Rep 1,986 Posts Drives: F90 M5C \| G06 X6 M60i Join Date: Nov 2010 Location: Rancho Cucamonga, CA iTrader: (13)	I do not mind it at all.
	Appreciate 0 Quote

02-08-2014, 10:16 AM	#9
Sedan_Clan Law Enforcer 25204 Rep 22,306 Posts Drives: '22 Chalk Gray Porsche C2S Join Date: Jun 2006 Location: ..in your rearview!!! iTrader: (26)	This is a silly ass thread.
	Appreciate 0 Quote

02-08-2014, 03:24 PM	#13
TheDeliverator First Lieutenant 11 Rep 393 Posts Drives: A Singularity Join Date: Mar 2012 Location: MD iTrader: (1) Garage List 2013 BMW M3 [0.00]	Yes, he\she's picky... not a bad thing Lottsa of m3 owners are. Just depends what we're picky about. For example: Plenty of e9x m owners hated how much the stock muffler hung down when viewed from the rear. OP: One of the benefits of aftermarket... as long as you're prepared to pay the ///mTax __________________ V1C / Bel STiR+ / Integrated mirror display / AD08r f255/35 r275/35 / IND Euro Bumper / MP Splitters / MP Steering Wheel
	Appreciate 0 Quote

02-08-2014, 04:26 PM	#15
///M5Bruno Private First Class 7 Rep 141 Posts Drives: e60 M5 Join Date: Oct 2011 Location: Los Angeles iTrader: (0)	Picky.
	Appreciate 0 Quote

02-08-2014, 06:57 PM	#18
damnitBobby Major 992 Rep 1,370 Posts Drives: 2018 M3 ZCP Join Date: Jan 2014 Location: Houston iTrader: (0)	back in the day i did a lot of reading on exhaust flow, back pressure, and how it affects power bands and throttle response etc.. To cut to the chase: having two mufflers does not always equate to more power, having larger diameter exhaust piping does not always equate to more power (but on FI applications bigger usually was better), incorporating an x-pipe in the exhaust flow usually resulted in a more desirable power band.. You're not picky, you're simply unaware.
	Appreciate 0 Quote

02-08-2014, 07:01 PM	#19
ixse Major 238 Rep 1,022 Posts Drives: 2015 boxster s Join Date: Jan 2013 Location: CA iTrader: (0)	^^ well put
	Appreciate 0 Quote

02-09-2014, 10:04 PM	#20
Mr Tonka is probably out riding. 6060 Rep 2,292 Posts Drives: Something Italian Join Date: Feb 2009 Location: Sweatypeninsula iTrader: (0)	2 mufflers. Sounds better, looks better, 1/2 the weight. And of course, not always the case. I couldn't care less about it being 1 or 2 mufflers but for me the related factors had me choose a 2 muffler design; on my E46 and E92 M3s. The E46 was based on sound and the E92 was a combo of weight and sound. The much cleaner look was a substantial bonus on the E92. __________________ "There is no greater tyranny than that which is perpetrated under the shield of the law and in the name of justice. -Charles de Secondat" Last edited by Mr Tonka; 02-10-2014 at 09:17 AM..
	Appreciate 0 Quote