Supressing the exhaust noise (with less HP loss)

clairvoyant · 03-13-2011, 06:09 PM

Folks, my current set up is:
UR high flow catted downpipes + RR catless midpipes + the stock exhaust.

FYI: Going totally catless IS NOT an option.
My question: which of the following configuration will reduce the exhaust noise with the least HP loss?

Configuration A:
Stock downpipes + RR catless midpipes + the stock exhaust

Configuration B:
UR high flow catted downpipes + stock catted midpipes + the stock exhaust

Thank You for well thoughts and well informed inputs/feedback in advance.

asian010 · 03-13-2011, 06:11 PM

B, or add a resonator to your current rr catless midpipe.

Jeff@TopGearSolutions · 03-13-2011, 06:26 PM

B... Like the addition of resonator as well.

clairvoyant · 03-13-2011, 06:28 PM

What kind of resonators do you guys recommend in lieu of secondary cats on the midpipes?
Thank You

Quote:

Originally Posted by JPSlick

B... Like the addition of resonator as well.

Javier · 03-13-2011, 07:38 PM

get the AE resonated downpipes and pair with stock exhaust

clairvoyant · 03-13-2011, 07:47 PM

Sorry, I can't go catless...the emission test here is very strict.

Quote:

Originally Posted by Javier

get the AE resonated downpipes and pair with stock exhaust

asian010 · 03-13-2011, 07:55 PM

u can buy some vibrant resonators online from their website and just cut and weld into your midpipe.

clairvoyant · 03-13-2011, 08:30 PM

What's the website? Thank You

Quote:

Originally Posted by asian010

u can buy some vibrant resonators online from their website and just cut and weld into your midpipe.

Dr. G · 03-13-2011, 08:37 PM

You find your current setup too loud?

clairvoyant · 03-13-2011, 08:42 PM

Some folks do.

Quote:

Originally Posted by Dr. G

You find your current setup too loud?

chancejat · 03-13-2011, 09:50 PM

just have a muff shop put strait through resonator's on your mids youll save money and you can chose how big you want em.

asian010 · 03-13-2011, 10:08 PM

http://vibrantperformance.com/catalo...Path=1022_1033

Jeff@TopGearSolutions · 03-13-2011, 10:10 PM

Quote:

Originally Posted by clairvoyant

What's the website? Thank You

My buddy's is a Vibrant dealer. Hit up www.speeddemonperformance.com

Shoot them an email. Hes going to need a part number so search on www.vibrantperformance.com for what you specifically want.

They range in lengths and diameter. As well as flow in terms of perforated core, most performance least sound deadening, to baffled which is more sound deadening, more loss of performance. Obviously the longer the more it can reduce sound.

They are universal so just pick the right length diamater style and piping size.

Mr. 5 · 03-13-2011, 11:21 PM

The stock rear mufflers are actually really loud.
Keep the stock H pipe and change your rear mufflers to magnaflow in left out right mufflers and you'll dig it.

Edit, config B will be better for power and be better for sound.

itsbrokeagain · 03-13-2011, 11:27 PM

I use vibrant mufflers in a lot of my applications...they are good quality. I built the X5 N55 exhaust with them, truck sounds mean...

clairvoyant · 03-14-2011, 01:48 AM

Guys, what's the diameter of the resonator that I need (given the RR midpipes)? Thank you

Mr. 5 · 03-14-2011, 10:32 AM

Quote:

Originally Posted by clairvoyant

Guys, what's the diameter of the resonator that I need (given the RR midpipes)? Thank you

2.5"

kmoto · 03-14-2011, 10:49 AM

amazon ftw. set of 2 for $100 shipped

Funkmob · 03-14-2011, 11:39 AM

I have a vanguard exhaust with catless downpipes , its getting too loud for my taste lately. I'm expecting RB turbo's soon and i hope that will solve alot of the drone and loud noise , cause i know the sloppy wastegates have alot to do with the bad sound.

If its still too loud i would like to add some resonators. The Vanguard is already equiped with 2 resonators in the midpipes.
So what should i do? Take the original resonators out and replace them with Vibrants , or should i add an extra set ?
I did not have a good look under the car , but do we have some space to mount these resonators ?
I like the extra quiet straight thru resonators that they advertise on their site , but maybe their diameter is too big to fit.

mattsfeir · 03-14-2011, 08:49 PM

Here's a link to a muffler that I added to Borla midpipes. Vibrant may work well also, but I wanted something with more sound absorbing material.

http://www.e90post.com/forums/showthread.php?t=486914

clairvoyant · 03-16-2011, 02:11 PM

Do those catalytic converters on the OEM midpipes actually reduce emission or just for there to suppress noise?

MDORPHN · 03-16-2011, 02:40 PM

Quote:

Originally Posted by clairvoyant

Do those catalytic converters on the OEM midpipes actually reduce emission or just for there to suppress noise?

They reduce emissions. And since a cat is a lot more expensive than a muffler or resonator, no manufacturer would use it primarily to suppress noise.

Neil

03-13-2011, 06:09 PM	#1
clairvoyant Major 79 Rep 1,032 Posts Drives: Bavarian Manure Wagon (BMW) Join Date: Oct 2007 Location: 45°19′20″N, 75°50′0″W iTrader: (5) Garage List 2007 335i [5.24]	Supressing the exhaust noise (with less HP loss) Folks, my current set up is: UR high flow catted downpipes + RR catless midpipes + the stock exhaust. FYI: Going totally catless IS NOT an option. My question: which of the following configuration will reduce the exhaust noise with the least HP loss? Configuration A: Stock downpipes + RR catless midpipes + the stock exhaust Configuration B: UR high flow catted downpipes + stock catted midpipes + the stock exhaust Thank You for well thoughts and well informed inputs/feedback in advance.
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03-13-2011, 06:11 PM	#2
asian010 Brigadier General 120 Rep 3,236 Posts Drives: 335i Join Date: Feb 2008 Location: bay area iTrader: (6)	B, or add a resonator to your current rr catless midpipe.
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03-13-2011, 06:26 PM	#3
Jeff@TopGearSolutions 3441 Rep 79,211 Posts Drives: C6 Z06, 09 335i, 10 335xi Join Date: Dec 2008 Location: www.TopGearSolutions.com iTrader: (37)	B... Like the addition of resonator as well.
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03-13-2011, 07:38 PM	#5
Javier Major 80 Rep 1,109 Posts Drives: 335i E92 Join Date: Nov 2006 Location: Puerto Rico iTrader: (0)	get the AE resonated downpipes and pair with stock exhaust __________________ 2007 328i Crimson Red SOLD 2010 335i MSport AW E92
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03-13-2011, 07:55 PM	#7
asian010 Brigadier General 120 Rep 3,236 Posts Drives: 335i Join Date: Feb 2008 Location: bay area iTrader: (6)	u can buy some vibrant resonators online from their website and just cut and weld into your midpipe.
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03-13-2011, 08:37 PM	#9
Dr. G Major General 278 Rep 5,062 Posts Drives: Black e92 335i Join Date: Apr 2010 Location: Brampton, Ontario iTrader: (32) Garage List e92 BMW 335i [8.84]	You find your current setup too loud? __________________ JB4 / OSS Angel Eyes / Downpipes / F1-Racewerks FMIC / Custom Meth Kit / BMS DCI / ER Chargepipe / HKS BOV / BMS Meth Elbow / BMW Performance Exhaust / Carbon Fiber Inlay Quad Tips / 19" Miro 111 / Front Aero Lip / M3 Sides / VRS CSL Trunk / Mtech Rear / DD CF Quad Finned Diffuser / LCI Tails / BBK / Smoked Reflectors / F1 Euphoria LED Interior / License LED's / GT 5000k Corners / 5000k HID Fogs / Air Scoops / LED Turn Signals / FK Silverline Coilovers / HPA endlinks / Vibrant Resonators / Osram CBI 5000k D1S
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03-13-2011, 09:50 PM	#11
chancejat First Lieutenant 17 Rep 310 Posts Drives: bmw Join Date: Mar 2010 Location: usa iTrader: (2)	just have a muff shop put strait through resonator's on your mids youll save money and you can chose how big you want em.
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03-13-2011, 10:08 PM	#12
asian010 Brigadier General 120 Rep 3,236 Posts Drives: 335i Join Date: Feb 2008 Location: bay area iTrader: (6)	http://vibrantperformance.com/catalo...Path=1022_1033
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03-13-2011, 11:21 PM	#14
Mr. 5 Modder Raider 753 Rep 8,633 Posts Drives: M3 Join Date: Apr 2007 Location: Surf City, HB iTrader: (31) Garage List 2007 e90 335i [8.00]	The stock rear mufflers are actually really loud. Keep the stock H pipe and change your rear mufflers to magnaflow in left out right mufflers and you'll dig it. Edit, config B will be better for power and be better for sound. __________________ e36 M3 Coupe, e36 325i Sedan e90 335i--SOLD Best 60-130-------------9.15 Seconds------------------WWW.MR5RACING.COM
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03-13-2011, 11:27 PM	#15
itsbrokeagain 310 Rep 15,745 Posts Drives: 1999 528iT, E53 X5, E46 325xi Join Date: Mar 2007 Location: Strong Island iTrader: (7)	I use vibrant mufflers in a lot of my applications...they are good quality. I built the X5 N55 exhaust with them, truck sounds mean...
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03-14-2011, 01:48 AM	#16
clairvoyant Major 79 Rep 1,032 Posts Drives: Bavarian Manure Wagon (BMW) Join Date: Oct 2007 Location: 45°19′20″N, 75°50′0″W iTrader: (5) Garage List 2007 335i [5.24]	Guys, what's the diameter of the resonator that I need (given the RR midpipes)? Thank you
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03-14-2011, 10:49 AM	#18
kmoto vroom 61 Rep 1,022 Posts Drives: Grocery Getter Join Date: Oct 2010 Location: Torrance iTrader: (4) Garage List 2023 G80 M3 Comp [0.00] 2020 F82 M4 [0.00] 2018 BMW 440i [0.00] 2015 BMW 328i [0.00] 2007 335i e92 [10.00]	amazon ftw. set of 2 for $100 shipped
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03-14-2011, 11:39 AM	#19
Funkmob First Lieutenant 22 Rep 306 Posts Drives: 335i E92 space grey Join Date: Oct 2009 Location: Belgium iTrader: (0)	I have a vanguard exhaust with catless downpipes , its getting too loud for my taste lately. I'm expecting RB turbo's soon and i hope that will solve alot of the drone and loud noise , cause i know the sloppy wastegates have alot to do with the bad sound. If its still too loud i would like to add some resonators. The Vanguard is already equiped with 2 resonators in the midpipes. So what should i do? Take the original resonators out and replace them with Vibrants , or should i add an extra set ? I did not have a good look under the car , but do we have some space to mount these resonators ? I like the extra quiet straight thru resonators that they advertise on their site , but maybe their diameter is too big to fit. __________________ 335I AT 2007. Vishnu V5 / UR CAI / HPF Intercooler / ER Charge pipe / Synapse BOV / Macht Shnell dp's / Vanguard catless exhaust / BSH occ / Labonte S4 Meth injection / Quiafe LSD / Full M3 suspension parts / Bilstein PSS10 / EBC brakes and lines / RB turbo's
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03-14-2011, 08:49 PM	#20
mattsfeir Lieutenant 37 Rep 458 Posts Drives: 335xi Join Date: Oct 2009 Location: CO iTrader: (2)	Here's a link to a muffler that I added to Borla midpipes. Vibrant may work well also, but I wanted something with more sound absorbing material. http://www.e90post.com/forums/showthread.php?t=486914
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03-16-2011, 02:11 PM	#21
clairvoyant Major 79 Rep 1,032 Posts Drives: Bavarian Manure Wagon (BMW) Join Date: Oct 2007 Location: 45°19′20″N, 75°50′0″W iTrader: (5) Garage List 2007 335i [5.24]	Do those catalytic converters on the OEM midpipes actually reduce emission or just for there to suppress noise?
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