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S-Class (W221) 2007-2013: S 320 CDI, S 350, S 450, S 500, S 550, S 420 CDI, S 600

Resonator Delete

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Old Dec 17, 2025 | 11:13 AM
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427Galaxie
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From: Pittsburgh PA
2013 S550
Resonator Delete
Hi, I was going to remove the resonators on my '13 S550 for a bit more sound. For those of you who have done it, are you just disconnecting the batteries when welding or dropping exhaust to weld? I only ask due to finicky electronics. I don't want to screw anything up while welding...

I would also love to find a safe (for the car) way to keep my rear muffler baffles open. Pretty much cannot see spending $780 for the Renntech module...

Thanks!
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Old Dec 17, 2025 | 04:19 PM
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From: Phoenix
222 S-65
Look at how the additional noise happens. Easy to work backwards from there.
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Old Dec 17, 2025 | 04:37 PM
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Originally Posted by JohnLane
Look at how the additional noise happens. Easy to work backwards from there.
So when you welded on your exhaust, off or on the car? Just trying to figure out how it effects the electronics on these cars. I always do it on. Just seeing if it triggers any issues.
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Old Dec 17, 2025 | 04:38 PM
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Originally Posted by JohnLane
Look at how the additional noise happens. Easy to work backwards from there.
Ah for the valves! I get it now.
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Old Dec 17, 2025 | 05:25 PM
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S500
batteries Off always safer - silly one under the dash too

electrics should be OK - just reset the windows and sunroof re anti trap afterwards
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Old Dec 20, 2025 | 12:11 PM
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W204 2010 C300 4matic Sport M272

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