What is this...
Thread Starter
Senior Member
Joined: Jul 2010
Posts: 424
Likes: 41
From: Sac, Ca
‘17 GT F1A E85 Monster ‘16 C63s
What is this...
Changing my oil the other day I noticed a little plastic box connected to the H section of my catback exhaust that had a wire/plug connected to it. I don’t have performance exhaust as far as my build sheet shows nor do I have the button near my mouse pad control. Wtf is it because it has to be a valve of some sort lol
Last edited by gOt BoOsT; Aug 16, 2019 at 09:19 AM.
MBWorld Fanatic!
Joined: Jun 2019
Posts: 1,453
Likes: 400
From: Flat Earth
AMG C63s Sedan , AMG C43 , AMG G63 , GLK 250
Changing my oil the other day I noticed a little plastic box near the H section of my catback exhaust that had a wire/plug connected to it. I don’t have performance exhaust as far as my build sheet shows nor do I have the button near my mouse pad control. Wtf is it because it has to be a valve of some sort lol
(after seeing your pic, YUP ..H Valve)
Thread Starter
Senior Member
Joined: Jul 2010
Posts: 424
Likes: 41
From: Sac, Ca
‘17 GT F1A E85 Monster ‘16 C63s
Thanks for the info. So these cars have an h valve flap on standard exhaust and both h valve and exhaust flaps on performance exhaust? Assuming h valve is voltage based for either boost reference or throttle position. Interesting
MBWorld Fanatic!
Joined: Jul 2011
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2019 AMG GT R
All cars have the H valve which opens/closes based on throttle input. PE then adds the different mufflers with their own set of valves which the button on the dash controls. That exhaust button does not control the H valve whatsoever. I have the PE and took out the H valve and replaced it with a straight section and noticed a deeper tone in the low rev range and combine that with the ASR module I love it and get some subtle pops occasionally in C mode too while braking.
