GT/C192/R192: New GT55, thoughts from a previous C63s owner
Have a question for the people that have the RaceChip GTS chip installed @Vic55 @theprototype @neonflx :
I took it to an independent Mercedes shop (it's a very highly reviewed one in the Phoenix area), and after looking at the included instructions, they were a bit confused because the instructions were kind of generic and the installation for the AMG GT Coupe would be a bit different. They were saying they'd need about 8 hours to research the locations for the connections and install it all, so like a $1200 install. Do any of you have advice for where I can take it that wouldn't charge nearly as much and would have a better idea of how to install it?
I took it to an independent Mercedes shop (it's a very highly reviewed one in the Phoenix area), and after looking at the included instructions, they were a bit confused because the instructions were kind of generic and the installation for the AMG GT Coupe would be a bit different. They were saying they'd need about 8 hours to research the locations for the connections and install it all, so like a $1200 install. Do any of you have advice for where I can take it that wouldn't charge nearly as much and would have a better idea of how to install it?
Have a question for the people that have the RaceChip GTS chip installed @Vic55 @theprototype @neonflx :
I took it to an independent Mercedes shop (it's a very highly reviewed one in the Phoenix area), and after looking at the included instructions, they were a bit confused because the instructions were kind of generic and the installation for the AMG GT Coupe would be a bit different. They were saying they'd need about 8 hours to research the locations for the connections and install it all, so like a $1200 install. Do any of you have advice for where I can take it that wouldn't charge nearly as much and would have a better idea of how to install it?
I took it to an independent Mercedes shop (it's a very highly reviewed one in the Phoenix area), and after looking at the included instructions, they were a bit confused because the instructions were kind of generic and the installation for the AMG GT Coupe would be a bit different. They were saying they'd need about 8 hours to research the locations for the connections and install it all, so like a $1200 install. Do any of you have advice for where I can take it that wouldn't charge nearly as much and would have a better idea of how to install it?
Last edited by neonflx; Sep 23, 2025 at 06:25 PM.
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Joined: Nov 2001
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2024 C8 Z06- 2025 BMW CS- 2022 Porsche 992 GTS
Have a question for the people that have the RaceChip GTS chip installed @Vic55 @theprototype @neonflx :
I took it to an independent Mercedes shop (it's a very highly reviewed one in the Phoenix area), and after looking at the included instructions, they were a bit confused because the instructions were kind of generic and the installation for the AMG GT Coupe would be a bit different. They were saying they'd need about 8 hours to research the locations for the connections and install it all, so like a $1200 install. Do any of you have advice for where I can take it that wouldn't charge nearly as much and would have a better idea of how to install it?
I took it to an independent Mercedes shop (it's a very highly reviewed one in the Phoenix area), and after looking at the included instructions, they were a bit confused because the instructions were kind of generic and the installation for the AMG GT Coupe would be a bit different. They were saying they'd need about 8 hours to research the locations for the connections and install it all, so like a $1200 install. Do any of you have advice for where I can take it that wouldn't charge nearly as much and would have a better idea of how to install it?
its probably 1-2 hours tops up front but there will be shop tax aka a bump- tell them 3 hours.
So I tried to get the AMG experience discount even though my car is 10 months used and applied for a race weekend. Didn't work lol. Ended up canceling it because my wife won't let me spend the $5k needed for it
That's unfortunate. I have mine scheduled for the 24th at Road Atlanta. The dealership didn't inform me of the perk. I just stumbled upon it. I was looking at scheduling and luckily saw where I could enter my car info for the credit. I was prepared to pay so it definitely was a nice surprise. The least they could do for the check I wrote lol.
Have a question for the people that have the RaceChip GTS chip installed @Vic55 @theprototype @neonflx :
I took it to an independent Mercedes shop (it's a very highly reviewed one in the Phoenix area), and after looking at the included instructions, they were a bit confused because the instructions were kind of generic and the installation for the AMG GT Coupe would be a bit different. They were saying they'd need about 8 hours to research the locations for the connections and install it all, so like a $1200 install. Do any of you have advice for where I can take it that wouldn't charge nearly as much and would have a better idea of how to install it?
I took it to an independent Mercedes shop (it's a very highly reviewed one in the Phoenix area), and after looking at the included instructions, they were a bit confused because the instructions were kind of generic and the installation for the AMG GT Coupe would be a bit different. They were saying they'd need about 8 hours to research the locations for the connections and install it all, so like a $1200 install. Do any of you have advice for where I can take it that wouldn't charge nearly as much and would have a better idea of how to install it?
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Joined: Nov 2001
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From: THE Orange County, California
2024 C8 Z06- 2025 BMW CS- 2022 Porsche 992 GTS
Another question for you three (and anyone else that has the RaceChip GTS5 black piggyback installed): Do any of you have a 2025 MY, and did you ever get a CEL thrown after the tune was hooked up? I’m getting DTC U0689 with the description “Lost communication with turbocharger/supercharger ‘B’ temperature sensor.” I’m going to reach out to RC but was curious if anyone else had a similar issue.
Same for me, I second the Faulty RC or maybe one of the connectors is not fully connected,
I have the same spec but in SL format, and I want to say that I also had a grievance with the seatbelt gismo thing being missing....however.... my sister just bought a CLE53 that has it, and I was even angrier because it looked so much cooler than in our cars, but actually looking at the thing operate, it pushes the seatbelt up almost exactly at the same position as where it is by default in my car. She still has to do the same body turn as me to reach it. I think it still would've cool, but I guess they considered it useless from a dimensions POV
I have the same spec but in SL format, and I want to say that I also had a grievance with the seatbelt gismo thing being missing....however.... my sister just bought a CLE53 that has it, and I was even angrier because it looked so much cooler than in our cars, but actually looking at the thing operate, it pushes the seatbelt up almost exactly at the same position as where it is by default in my car. She still has to do the same body turn as me to reach it. I think it still would've cool, but I guess they considered it useless from a dimensions POV
Another question for you three (and anyone else that has the RaceChip GTS5 black piggyback installed): Do any of you have a 2025 MY, and did you ever get a CEL thrown after the tune was hooked up? I’m getting DTC U0689 with the description “Lost communication with turbocharger/supercharger ‘B’ temperature sensor.” I’m going to reach out to RC but was curious if anyone else had a similar issue.
So I got my first warning light today - low engine oil, add one quart, recheck after next refueling. I guess I had it coming, I do drive aggressively lol. Now gotta find time to take it to the dealer to see if warranty will cover it
Anyone consider doing a secondary cat delete on their car? I had almost forgot I did this on my c63s and it was the final touch (in addition to new catback) that made the exhaust perfect. Seriously considering it on the GT if it won’t throw a CEL like with my c63!
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Joined: Nov 2001
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From: THE Orange County, California
2024 C8 Z06- 2025 BMW CS- 2022 Porsche 992 GTS
And these cars dont have resonators either... just big *** rear cans which I pulled and added a valve controller.
Ah dang it, even with the muffler delete I want this thing a little louder lol
4) I think this is just me needing to fiddle around more but I'm only 6ft tall and I feel cramped in the cockpit. I feel like I should be able to move the seat further back than I can, for now I'm just bending my knees to make it work. Is this just me? No way anyone 6'3 or taller could fit comfortably in this car the way it is right now.
On another note, would someone measure the trunk height from the floor to the hatch level at the back and midway in? I am would like to know if a certain cooler would fit for road trips. I do not have mine yet.
Thanks.
Last edited by Bigwaved; Jan 26, 2026 at 12:26 PM.
Did you figure the seat positioning out? When I was test driving, the seat would self adjust the seat back more upright than I had it set after adjusting seat rearward to a certain point. I did not have enough time to mess with it, but I was too upright when I had the seat positioned far enough back for my legs.
On another note, would someone measure the trunk height from the floor to the hatch level at the bak and midway in? I am would like to know if a certain cooler would fit for road trips. I do not have mine yet.
Thanks.
On another note, would someone measure the trunk height from the floor to the hatch level at the bak and midway in? I am would like to know if a certain cooler would fit for road trips. I do not have mine yet.
Thanks.
To be honest even with my muffler delete combined with the EVM I feel like the car should be louder so you're probably just expecting more. The EVM will just keep the valves open at lower RPM's than it would normally open. So as far as sound the EVM will make no real difference than what you're already hearing during spirited driving. I'll try to add a clip at some point but with the way you can't rev the car in park beyond 3-4k it's going to be hard to hear the difference.
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Joined: Nov 2001
Posts: 12,251
Likes: 890
From: THE Orange County, California
2024 C8 Z06- 2025 BMW CS- 2022 Porsche 992 GTS
https://www.myq.com/auto/mercedes-benz
Enjoy the EVM don't forget to post sound clips : )
Enjoy the EVM don't forget to post sound clips : )
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Joined: Nov 2001
Posts: 12,251
Likes: 890
From: THE Orange County, California
2024 C8 Z06- 2025 BMW CS- 2022 Porsche 992 GTS
I tried setting up myQ account and it worked, however when prompted it opens both garage doors. Does anyone have 2 grage doors with myQ and is able to close/open the doors independently by using voice through the voice command? Is there a way to reference one vs the other?
Is it an app that uses homelink to open your garage door when you are not home?





