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  #1  
Old 11-08-2008, 09:33 AM
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Resonator

I have an awful sound coming from my exhaust at low low speeds, and was told it was the resonator. Probably a stupid question, but what is this, how much is one, and can i just get it taken out without a huge change in exhaust loudness?
Thanks!

Last edited by kis86; 11-08-2008 at 09:49 AM.
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  #2  
Old 11-08-2008, 04:35 PM
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Manarius Manarius is offline
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Re: Resonator

Quote:
Originally Posted by kis86 View Post
I have an awful sound coming from my exhaust at low low speeds, and was told it was the resonator. Probably a stupid question, but what is this, how much is one, and can i just get it taken out without a huge change in exhaust loudness?
Thanks!
Get it cut out. Little change in loudness. Just make sure it's welded up correctly.
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(8/23/07-Present) 1995 Subaru SVX LSi (197k) Polo Green (#1102) 03/95
Mods: DDM Tuning 4500k 35w Low Beam HID, 100w H3 Bulbs, Extra Ground Cables, 15 minute $12.96 mod,
svxfiles designed transmission mount (), sporting a "new" tail light bar,
silver BBS rims, custom power steering cooler (one that doesn't dump ATF constantly), new negative lead cable, no more third or fourth gear
(1977-Present) 1977 Chevrolet Corvette (81k) Silver
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  #3  
Old 11-08-2008, 04:42 PM
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Re: Resonator

The resonator is similar to a muffler. Look under the car from just in front of the rear wheels. Follow the exhaust pipe forward from the muffler and the next big bulge is the resonator. Mine was removed and a piece of pipe welded in with very little change in sound, just a tiny bit raspier.
It's around $300.00 from Subaru but aftermarket will work.
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  #4  
Old 11-08-2008, 04:49 PM
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Re: Resonator

I think I'll try just having it taken out. Thanks for the help!
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  #5  
Old 11-08-2008, 05:23 PM
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Re: Resonator

The resonator is there for a reason. It is positioned at a nodal point in the exhaust stream. It affects the velocity at which the engine scavenges burnt gases, particularly at low revs.

If you replace it with a straight pipe your car will produce lower torque at low revs, and we all know the SVX prefers to change up gears quick and runs at low revs most of the time.

My advice is to replace it with a cheaper aftermarket resonator. The Subaru one is way too expensive, particularly as we know they all eventually rattle, so it is not exactly Rolls Royce build.

My 2c

Joe
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  #6  
Old 11-08-2008, 05:34 PM
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Re: Resonator

Quote:
Originally Posted by svxistentialist View Post
The resonator is there for a reason. It is positioned at a nodal point in the exhaust stream. It affects the velocity at which the engine scavenges burnt gases, particularly at low revs.

If you replace it with a straight pipe your car will produce lower torque at low revs, and we all know the SVX prefers to change up gears quick and runs at low revs most of the time.

My advice is to replace it with a cheaper aftermarket resonator. The Subaru one is way too expensive, particularly as we know they all eventually rattle, so it is not exactly Rolls Royce build.

My 2c

Joe
I have the resonator delete and I can't really feel any lower torque than any other SVX I've ridden in.
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(8/23/07-Present) 1995 Subaru SVX LSi (197k) Polo Green (#1102) 03/95
Mods: DDM Tuning 4500k 35w Low Beam HID, 100w H3 Bulbs, Extra Ground Cables, 15 minute $12.96 mod,
svxfiles designed transmission mount (), sporting a "new" tail light bar,
silver BBS rims, custom power steering cooler (one that doesn't dump ATF constantly), new negative lead cable, no more third or fourth gear
(1977-Present) 1977 Chevrolet Corvette (81k) Silver
(12/01/2011-Present) 2005 Subaru Outback 2.5i Limited 5MT (97k)
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  #7  
Old 11-08-2008, 05:44 PM
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Re: Resonator

If I replace it with an after-market one, any recommendations?
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  #8  
Old 11-08-2008, 06:01 PM
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Re: Resonator

Quote:
Originally Posted by Manarius View Post
I have the resonator delete and I can't really feel any lower torque than any other SVX I've ridden in.
Jason, I did the straight pipe on my claret, and I never liked the sound of the exhaust afterwards. Blacky mentioned raspier, but mine had a blare that was hard to like.

The change in torque will be minimal and not easy to notice by seat of the pants. It will only have an effect at low [1500-2000 rpm] revs. Higher than this horsepower output increases and the lack of torque can't be noticed.

It's likely the reduction of low rpm torque will only show as higher consumption around town, not on the open road.

Jegs would be where I would look for a replacement.

Joe
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  #9  
Old 11-08-2008, 10:41 PM
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Re: Resonator

Quote:
Originally Posted by svxistentialist View Post
Jason, I did the straight pipe on my claret, and I never liked the sound of the exhaust afterwards. Blacky mentioned raspier, but mine had a blare that was hard to like.

The change in torque will be minimal and not easy to notice by seat of the pants. It will only have an effect at low [1500-2000 rpm] revs. Higher than this horsepower output increases and the lack of torque can't be noticed.

It's likely the reduction of low rpm torque will only show as higher consumption around town, not on the open road.

Jegs would be where I would look for a replacement.

Joe
I guess that's fair. My exhaust isn't perfect. It's a budget exhaust. If I had money, I would have replaced the resonator with another resonator, but since I was strapped for cash, the straight pipe stayed. It sounds a little different and I don't mind so much.
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(8/23/07-Present) 1995 Subaru SVX LSi (197k) Polo Green (#1102) 03/95
Mods: DDM Tuning 4500k 35w Low Beam HID, 100w H3 Bulbs, Extra Ground Cables, 15 minute $12.96 mod,
svxfiles designed transmission mount (), sporting a "new" tail light bar,
silver BBS rims, custom power steering cooler (one that doesn't dump ATF constantly), new negative lead cable, no more third or fourth gear
(1977-Present) 1977 Chevrolet Corvette (81k) Silver
(12/01/2011-Present) 2005 Subaru Outback 2.5i Limited 5MT (97k)
I have a bad feeling about this.
-Obi Wan Kenobi
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  #10  
Old 11-09-2008, 06:58 AM
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Re: Resonator

Quote:
Originally Posted by kis86 View Post
If I replace it with an after-market one, any recommendations?

The Aero AR25 is a great resonator. It runs about $60.00.

AR25 resonator

Here is a photo of it installed in my 96 Polo



Verocious Motorsports also has a Magnaflow resonator 14416 It is a 4" round diameter, 14" long, (20" overall) for $67.00 or less
http://www.performancepeddler.com/de...D=MAG14416#img

.
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JFICX8659TH100216.....Date of Manufacture: November 16, 1995.....
Fuji Heavy Industries..Ōta North Plant....Ōta City,. Gunma Prefecture, Japan

In-Service Date: January 2, 1997



"The Pristine Green Polo Machine”
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First Clear front turn signals, JDM Alcyone hood emblem, rear panel, and BOXER engine cover on the Network (US) (2000)
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HID lighting (5000K) for headlight and H3 fog lights, PIAA SuperExtreme 120W high beams, rebuilt EG33 longblock, Cometic head gaskets, Phase II flexplate, AMR aluminum radiator with custom silicone hoses, 160A high-output alternator in aluminum-ceramic coated case, new design alternator wiring upgrade v.4, rare factory headlight protectors, refinished JDM BBS mesh aluminum wheels and custom, polished billet aluminum new hex center caps, LED grille mod, R1 Concepts high-carbon cryo slotted rotors, Akebono ceramic pads, Goodridge S/S braided brake lines, Smallcar Stage 1 shift kit, ThermalTech aluminum/ceramic-coated valve covers, Energy Suspension urethane front & rear swaybar bushings, Bontrager22 rear swaybar with QS Components Chromoly Teflon/Kevlar endlinks, "$15.00/5 minute" suspension mod. Hella Supertone horns, Custom stainless steel exhaust system with 2" headpipes, Magnaflow cats, AeroTurbine AR25 resonator /AWD "Bullet" muffler.


R.I.P. 2010 Subaru Outback Limited 2.5 CVT...338,000 miles. Totaled by a 1,300 lb. COW March 4, 2016

2014 Hyundai Avante Limited ...178,000 miles. Actually quieter and smoother than the Outback

2007 Mazda Miata MX-5 PRHT...102,000 miles.
Plenty of parts, service and windshields.


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Last edited by svxcess; 10-19-2009 at 12:48 PM.
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  #11  
Old 11-09-2008, 08:19 AM
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Re: Resonator

Hmm, maybe I'll look at replacing it if it's less than 100 bucks said and done. Is it 2 1/2" or 2"?
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  #12  
Old 11-09-2008, 09:08 AM
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Re: Resonator

Quote:
Originally Posted by kis86 View Post
Hmm, maybe I'll look at replacing it if it's less than 100 bucks said and done. Is it 2 1/2" or 2"?
The AR25 resonator is 2.5" in and 2.5" out.

I also had AR20 resonators installed in place of the front cats for awhile. They were 2" in and 2" out (see photo) They work well for the 1992-1995 SVX, but my 96 with OBDII needed true cats up front, so I replaced them with Magnaflow cats very inexpensively.

.
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Subaru Ambassador

1996 Polo Green LSi #216..138,100 miles...SOLD

JFICX8659TH100216.....Date of Manufacture: November 16, 1995.....
Fuji Heavy Industries..Ōta North Plant....Ōta City,. Gunma Prefecture, Japan

In-Service Date: January 2, 1997



"The Pristine Green Polo Machine”
First Polo Green on the Network
First Clear front turn signals, JDM Alcyone hood emblem, rear panel, and BOXER engine cover on the Network (US) (2000)
First 5000K HID factory fog lights (2007)
First SVX JDM BBS wheels on a USDM SVX (2013)

HID lighting (5000K) for headlight and H3 fog lights, PIAA SuperExtreme 120W high beams, rebuilt EG33 longblock, Cometic head gaskets, Phase II flexplate, AMR aluminum radiator with custom silicone hoses, 160A high-output alternator in aluminum-ceramic coated case, new design alternator wiring upgrade v.4, rare factory headlight protectors, refinished JDM BBS mesh aluminum wheels and custom, polished billet aluminum new hex center caps, LED grille mod, R1 Concepts high-carbon cryo slotted rotors, Akebono ceramic pads, Goodridge S/S braided brake lines, Smallcar Stage 1 shift kit, ThermalTech aluminum/ceramic-coated valve covers, Energy Suspension urethane front & rear swaybar bushings, Bontrager22 rear swaybar with QS Components Chromoly Teflon/Kevlar endlinks, "$15.00/5 minute" suspension mod. Hella Supertone horns, Custom stainless steel exhaust system with 2" headpipes, Magnaflow cats, AeroTurbine AR25 resonator /AWD "Bullet" muffler.


R.I.P. 2010 Subaru Outback Limited 2.5 CVT...338,000 miles. Totaled by a 1,300 lb. COW March 4, 2016

2014 Hyundai Avante Limited ...178,000 miles. Actually quieter and smoother than the Outback

2007 Mazda Miata MX-5 PRHT...102,000 miles.
Plenty of parts, service and windshields.


4th Registered Network member —2/21/2001

My NEW locker..I...My Email..I..Wikipedia/SVX .

.
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  #13  
Old 11-09-2008, 10:56 AM
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Re: Resonator

I've also heard of people using a Cherry Bomb type muffler as a resonator but I don't know how it would affect the sound, but they run ~$30 at most auto parts stores.
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  #14  
Old 11-10-2008, 06:53 AM
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Re: Resonator

SVXCESS;

How did you handle the offset in the stock resonator? Did you replace the entire pipe run of the stock resonator? Or cut out the old and install new resonator in old pipe?
Thanks for sharing your experence!
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  #15  
Old 11-10-2008, 07:52 AM
XT6Wagon XT6Wagon is offline
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Re: Resonator

If you want your car to be quiet and not have any part of the rev range boom or get stupidly loud, try two resonators of different lengths.
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