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Discussion Starter · #1 ·
From what a speedshop told me, I should remove the resonator and the exhaust pipe that goes from the cat to the muffler. He said to me that it wouldn't be expensive and I could feel a real difference. I am just wondering if someone have done that because I am a bit scared by the result(more sound from inside) if I remove the resonator.

Any feedback guys?
 

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2.5" Straight Pipe...

Been there, done that!
A lot of us have already performed
this mod. For me it was $35 at the
muffler shop. By itself - no sound increase.
Intake + straight pipe = another story...
Use "search" for additional
info.
 

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Discussion Starter · #3 ·
Thanks for your input...

And BTW, I will change the Intake also for a Frankencar. I know that Intake gives a louder sound from the inside. I had a AEM CAI on my Accord V6. When the VTEC came in at 3800rpm, the sounds doubled from the inside. It's probably the same with every car with an intake.

I was just wondering if removing the resonator will increase the sound because that is not what I want. Based on your experience, I am glad that the answer is no.
 

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Benny said:
Thanks for your input...

And BTW, I will change the Intake also for a Frankencar. I know that Intake gives a louder sound from the inside. I had a AEM CAI on my Accord V6. When the VTEC came in at 3800rpm, the sounds doubled from the inside. It's probably the same with every car with an intake.

I was just wondering if removing the resonator will increase the sound because that is not what I want. Based on your experience, I am glad that the answer is no.
2.5" pipe with muffler=bearable sound from inside
2.5" pipe w/muffler w/intake=really loud..sometimes gets annoyingly loud.
I have both..I sometimes wish it was quieter.
 

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Curious...

Benny said:
Thanks for your input...

And BTW, I will change the Intake also for a Frankencar. I know that Intake gives a louder sound from the inside. I had a AEM CAI on my Accord V6. When the VTEC came in at 3800rpm, the sounds doubled from the inside. It's probably the same with every car with an intake.

I was just wondering if removing the resonator will increase the sound because that is not what I want. Based on your experience, I am glad that the answer is no.
Yeah, I was wondering the same thing before I did it.
In particular, do to the fact that I already had my Intake
on. But I was pleasantly surprised. I think most of the baffling
goes on in the mufflers anyway. I have no idea why Nissan
put a coffin size resonator in there in the first place!:angry4:
 

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Discussion Starter · #7 ·
Alphafox

The resonator under the car, between the cat and the mufflers. (yes, that bi thing, one of the biggest in the industry).
For the one who removed it, have you notice any performance gain?
 

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Re: What Does It Do...

SE-Rious said:
Think of it as another muffler hidden away.
Purpose? To baffle sound and add weight!
Not quite. Here's a good explanation:
An exhaust resonator is used in some exhaust stystems to change the tone and timber of the exhaust sound. The resonator helps reduce the annoying vibrations of exhaust gas pulses with a length of perforated tubing inside an expansion chamber. The exhaust gasses partially escape the tubing diameter through the perforations into the expansion chamber. In the expansion chamber, the exhaust gasses expand and change tone. When the gasses re-enter the tubing, they rejoin the exhaust flow and dampen the vibrations of the combined flow, creating a more pleasing sound.
I don't think removing the resonator will improve power at all. It will just make the engine sound different or a bit more loud.

This is part of a small article on exhaust system tuning, that I highly recommend:

http://www.bmwe34.net/E34main/Upgrade/Exhaust.htm

A.
 

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Very Eloquent, But...

aquiname said:

Not quite. Here's a good explanation:

I don't think removing the resonator will improve power at all. It will just make the engine sound different or a bit more loud.

This is part of a small article on exhaust system tuning, that I highly recommend:

http://www.bmwe34.net/E34main/Upgrade/Exhaust.htm

A.
Long winded explanation for what I just said...
a resonator baffles or muffles sound just like
a muffler!

To me, they're just dead weight on the 3.5's restrictive
exhaust system.
 

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Re: Very Eloquent, But...

Originally posted by SE-Rious
Long winded explanation for what I just said...
a resonator baffles or muffles sound just like
a muffler!
I never said you were wrong. :angel1: I just thought I'd enhance your short but accurate explanation by adding that its purpose seems to be more to alter the sound than to muffle it.

To me, they're just dead weight on the 3.5's restrictive
exhaust system.
Well, I guess it comes down to a tradeoff between sound volume and weight. I assume you've taken it off, so maybe you can tell us how much does it weigh?

Thanks
 

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Re: Re: Very Eloquent, But...

aquiname said:


I never said you were wrong. :angel1: I just thought I'd enhance your short but accurate explanation by adding that its purpose seems to be more to alter the sound than to muffle it.



Well, I guess it comes down to a tradeoff between sound volume and weight. I assume you've taken it off, so maybe you can tell us how much does it weigh?

Thanks
Gladly.
It's sitting in a box out in my storage shed.
I'll put it on my bathroom scale this weekend
and let you know!
 

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Re: Re: Very Eloquent, But...

aquiname said:


I never said you were wrong. :angel1: I just thought I'd enhance your short but accurate explanation by adding that its purpose seems to be more to alter the sound than to muffle it.



Well, I guess it comes down to a tradeoff between sound volume and weight. I assume you've taken it off, so maybe you can tell us how much does it weigh?

Thanks
OK..like...dude..like if you do that you can have a beer in the car when you are driving and you dont lose any weight advantage.
 

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Re: Re: What Does It Do...

aquiname said:

Not quite. Here's a good explanation:

I don't think removing the resonator will improve power at all. It will just make the engine sound different or a bit more loud.

This is part of a small article on exhaust system tuning, that I highly recommend:

http://www.bmwe34.net/E34main/Upgrade/Exhaust.htm

A.
Makes me want to put my reflection muffler on NOW!
 

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Resonator Specs...

For those of you who want to know (aquiname), here are the
specs for the 3.5 resonator:

1) Weight - 13 lbs.
2) Length - 33, 1/2 inches
3) Width, at it's widest - 7 inches

Doing the resonator to straight pipe conversion
probably saves you at least 10 lbs if you assume
a hollow 2 & 1/2 ft, 2.5" piece of aluminum weighs
3lbs.

Not a lot to some but in my book, every lb counts!
 
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