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96 STS
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112 Posts
Discussion Starter #1
If I were to remove the resonator would I still be able to pass emissions. I've heard that you may get a couple of horses by removing them but my question is is it worth removing it.
 

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'94 pearl sts
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99 Posts
If I were to remove the resonator would I still be able to pass emissions. I've heard that you may get a couple of horses by removing them but my question is is it worth removing it.
By resonator, do you mean muffler..? The muffler shouldn't affect emissions, but you should look into your local laws about noise violations..

If you mean the catalytic convertor, which would make more sense, it would add some horses, yes.. but you would definitely not pass any emission tests. I'm not sure about the newer ones, but I've seen people punch out the honeycomb style ones with a piece of pipe. Basically, the less restricted airflow is into and out of the engine, the more horses you'll get.
 

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'87 Jeep, '10 Thruxton, '00 Duc 748, '01 748R (853cc)
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He's referring to the resonator (not muffler, or catalytic converter) located in the mid pipe between the cat, and the y-section where it branches off to both mufflers. Removing it may gain you a little bit of power, but at the expense of more noise in both outside, and inside th vehicle. As for emissions, it won't really affect it that much, since it's after the cat, and both O2 sensors. If your going to go through the trouble of hacking out the resonator and welding in a new section of straight pipe, you might as well change the rest of your exhaust system for something a little less restrictive.
 

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White Diamond '03 DHS (with DTS floor shift)
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I would venture a guess that any gain in HP will be undetectable by the SOP (Seat Of the Pants) dyno.
 

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'94 pearl sts
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99 Posts
He's referring to the resonator (not muffler, or catalytic converter) located in the mid pipe between the cat, and the y-section where it branches off to both mufflers.
Whoops, my bad.. guess I haven't spent enough time under these cars :thepan:
 

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2002 Cadillac Deville
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22 Posts
I agree with the exhaust comment. I recently upgraded my 02 Deville's exhaust by removing the resonator, replacing it and the entire exhaust system with 3 inch stainless and then switched the factory mufflers to Dynomax Super Turbos. Nice mellow sound and very little if not no interior resonance. Jump on the throttle and she screams! Just what the doctor ordered!
 

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1999 STS - diamond white
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5,229 Posts
I agree with the exhaust comment. I recently upgraded my 02 Deville's exhaust by removing the resonator, replacing it and the entire exhaust system with 3 inch stainless and then switched the factory mufflers to Dynomax Super Turbos. Nice mellow sound and very little if not no interior resonance. Jump on the throttle and she screams! Just what the doctor ordered!
That is worth some pics here!
 

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95 Fleetwood Brougham / 01 DTS / 11 CTS Lux / 11 DTS Platinum
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7,085 Posts
The resonators purpose is to lessen the noise. I think back in the day the purpose was to catch any sparks that may have come from the exhaust but now It's all about the nose reduction.

If you remove it you car will be louder. I don't see any reason why you would fail emissions because of it. As far as HP gain. Probably very minimal if any. The resonator isn't very restrictive.
 

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2002.5 F55 CORSA STS, 2014 Explorer XLT FWD
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67,963 Posts
FYI, did a tailpipe emissions test of my '02 STS before and after the CORSA install in November. No change in CO, CO2, NO, no codes, nothing. BUT, be careful when you pull the after-cat O2 sensor in order to cut the pipe to the first resonator/muffler.....don't kink the wires or twist them too much. Something about a "clean air reference signal".
 

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That is worth some pics here!
lol just cut out my resonator due to no salty ness and having to replace back crossmember had to cut near purfect exhaust from cat back cuase I used a sawes all wood/metal blade said don’t need the resenator had to put rear mufflers back in sounds of a 5.3 almost and and no more check engine lights

Nh USA and salt not no salt spell check isn’t what makes America great just like Obama care

Put the rear sensor back in got a year and a half till it’s ok for my ride to pollute lol even tho vw just uses chips to cheat the system

Got 2 o2 and she runs hard unlike my moms vw 2.0 inline vw vs my 2x the parts then it’s got 2x more cams v8 vw are over complicated pieces of shits lol got 20000 more than that piece of shit vw beetle and I’d smoke that piece of shit all day sad when a in-line engine blows at 104000 that’s sad as I got about 3x the power and 1000 pounds atleast to hual

Whoops, my bad.. guess I haven't spent enough time under these cars :thepan:
 

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2002.5 F55 CORSA STS, 2014 Explorer XLT FWD
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Welcome to Cadillac Forums !!! There is no reason to post 7 posts in a single thread within 10 minutes. Put it all in one thread for ease of reading and continuity.

What car do you drive - and what on earth are you talking about in your post ?
 
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