Renntech EVM
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C63S Coupe/CLA45
Exhaust Valve Module that keeps the rear flaps open all the time. I plan on buying a 2020 Porsche GT4. I had a 2017 C63S then a 2020. Never gave me issues other than thermostat failure but that was on Mercedes. I still have a 2019 GLC63S as my daily
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From: SEPA
2021 C63S AMG
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2019 c63 cabriolet
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2019 c63 cabriolet
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Thread Starter
Member
Joined: Apr 2017
Posts: 185
Likes: 36
From: San Diego
C63S Coupe/CLA45
Thread Starter
Member
Joined: Apr 2017
Posts: 185
Likes: 36
From: San Diego
C63S Coupe/CLA45
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Joined: Feb 2026
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just installed the Renntech EVM on my 2022 GLE 53, and I'm loving the extra power and the ability to adjust the sound of the exhaust. It's a night and day difference from the stock setup, and the installation was pretty straightforward. Only thing to note is that you'll need to get a remap done afterwards for the ECU to play nice with the EVM.
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Member
Joined: Apr 2017
Posts: 185
Likes: 36
From: San Diego
C63S Coupe/CLA45
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Joined: May 2022
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From: Los Angeles
'19 C63 Cabriolet
Posting here to help anyone in the future looking to purchase the EVM.
I just got it for my c63 and it’s awesome. The bass and rumble it adds when cruising is satisfying.
Not sure how public this info is so gatekeeping it behind DM. You can get this EVM brand new, legit, shipped to your USA address in 1-3 business days for less than $375 lol (it’s not a China rip off or non-name brand)
There is zero reason to pay $600+ or even to wait around and buy used for $400-500.
DM and I’ll share info.
I just got it for my c63 and it’s awesome. The bass and rumble it adds when cruising is satisfying.
Not sure how public this info is so gatekeeping it behind DM. You can get this EVM brand new, legit, shipped to your USA address in 1-3 business days for less than $375 lol (it’s not a China rip off or non-name brand)
There is zero reason to pay $600+ or even to wait around and buy used for $400-500.
DM and I’ll share info.
Last edited by jaydp; Apr 2, 2026 at 07:32 PM.
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For those who don't want to buy RENNTech and also want to support the original maker, without paying the additional cost due to the licensing fees to be sold in the USA, buy from ASR, use a mail forwarding service and forward it over. Same module as the RENNtech but from the original creator.
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This is a good question, ASR doesn't have a tutorial for that, there seems to be tiny screws at the back maybe can be replaced with corresponding button batteries. Not sure if RENNTech has instructions as well, best to email both companies.
