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      03-13-2011, 06:09 PM   #1
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2007 335i  [2.62]
Question 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
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B, or add a resonator to your current rr catless midpipe.
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      03-13-2011, 06:26 PM   #3
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B... Like the addition of resonator as well.
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      03-13-2011, 06:28 PM   #4
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2007 335i  [2.62]
Question

What kind of resonators do you guys recommend in lieu of secondary cats on the midpipes?
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Originally Posted by JPSlick View Post
B... Like the addition of resonator as well.
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      03-13-2011, 07:38 PM   #5
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get the AE resonated downpipes and pair with stock exhaust
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      03-13-2011, 07:47 PM   #6
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Exclamation

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

Quote:
Originally Posted by Javier View Post
get the AE resonated downpipes and pair with stock exhaust
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      03-13-2011, 07:55 PM   #7
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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, 08:30 PM   #8
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What's the website? Thank You
Quote:
Originally Posted by asian010 View Post
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
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You find your current setup too loud?
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      03-13-2011, 08:42 PM   #10
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Unhappy

Some folks do.

Quote:
Originally Posted by Dr. G View Post
You find your current setup too loud?
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      03-13-2011, 09:50 PM   #11
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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
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http://vibrantperformance.com/catalo...Path=1022_1033
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      03-13-2011, 10:10 PM   #13
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Quote:
Originally Posted by clairvoyant View Post
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.
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      03-13-2011, 11:21 PM   #14
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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.
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      03-13-2011, 11:27 PM   #15
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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
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Guys, what's the diameter of the resonator that I need (given the RR midpipes)? Thank you
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      03-14-2011, 10:32 AM   #17
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Quote:
Originally Posted by clairvoyant View Post
Guys, what's the diameter of the resonator that I need (given the RR midpipes)? Thank you
2.5"
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      03-14-2011, 10:49 AM   #18
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amazon ftw. set of 2 for $100 shipped
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      03-14-2011, 11:39 AM   #19
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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.
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      03-14-2011, 08:49 PM   #20
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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
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Question

Do those catalytic converters on the OEM midpipes actually reduce emission or just for there to suppress noise?
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      03-16-2011, 02:40 PM   #22
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Quote:
Originally Posted by clairvoyant View Post
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
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