Very familiar as this is my 9th amg. If you have had the experience of adding 108hp to any german car its very very expensive. Then to do it with warranty is next to impossible. The one thing that's strange is if all was identical then once they are both tuned their hp should be identical which they are not

I've actually been to the factory and learned first hand how they do it. The differences between the power levels are pistons (piston length/shape to change the compression ratio, and depending on the power level forged or non-forged), turbo size, turbo type (single vs twin-scroll) and boost pressure. This engine is good for over 600 hp already with the proper piston, turbos and boost combination, so the 575 hp is not some kind of a huge feat. They've been there done that. I haven't looked at the detailed specs, but based on the power levels the variant in the GT 55 most likely has non-forged pistons and single scroll turbos like the C63/S had and the one in the 63 has forged pistons, twin-scroll turbos and higher boost pressures like the E63S and GT63S 4-door and most likely the compression ratios are different between the two, so yes an ECU tune is not gonna turn the GT 55 into a GT 63 that much I agree with. As said, they've gotten their mileage out of this engine. As much as I like it, it is a bit of a parts bin effort between the different models. They are just reusing what they've already got.

The interesting development was the flat-plane M178 version for the GT Black Series and now the supposed flat-plane version of the M177 they are working on to be unveiled in the CLE 63. But the current GT 63 has the proven existing M177 that we already know and love, but not even at its highest power level. No longer the M178 as the previous GT, which is the dry-sump version of the M177 as you probably know.

I’ve spoken both with my local dealer and the German car mechanic in my city, both said renntech stage 1 tune is completely convertible back to stock in a moments notice, thus not voiding warranty.
There obviously is fine print that if your car were to have failures as a direct result of the tune, then it voids warranty. But from my research so far and conversations with others they’ve told me the stage 1 figures are more than safe.

renntech stage 1 for the GT55 is for around $3200USD. Plus 1k or so for installation if you get it done from a reputable shop. That’s about 4k-ish.

Yeah I came to the same conclusion right before I made my decision. IMO at that point you’re essentially just paying for the badge.

Is this the Renntech Stage 1 tune you refer to?
https://www.renntechmercedes.com/ind...-192-55-detail

Thing is if they (MB Germany) really want to look through it they will catch it even if reversed, there will always be traces of it one way or the other.

63 has its prestige I guess. I mean people probably buy the C 63 S E Performance for the badge not the four cylinder /s

On the C192 its a piggy back module

just an fyi ...



Ironically, the spec I liked more was in the 55 but the dealer said his deal was on the 63 which I took.

This 55 has the said Renntech tune box and I did recently post this too- its situational but it does show how the factory tune has a better higher rpm sweet spot that of a piggy and it also shows that AMG probably underrates their engines (probably in both cases). Of course this is a point in time run with **** conditions so both cars probably had some spin.

Thank you dearly for all this information and the explanation, I always thought it was simply through software.

An MB dealership doing drag races that is kind of cool.

Turns out most of their videos are drag races, that is extra cool!

Wow, great video, thanks for linking it!
Yeah, I know it’s a piggyback module, which is actually what made it so interesting to me that it’s easily reversible back to stock.

The tuned 55 has a wild jump off the line, but at higher speeds and RPMs, you can definitely see the 63 for what it is. I was in a similar situation as you, really wanted the 63, but the 55 had the exact spec I was looking for. After comparing costs, I decided to save the $30K since the performance difference (with or even without a tune) just didn’t justify the price for me personally. Mind you I don't track cars at all, so I will rarely if at all be using the car to its absolute potential.

Sounds like you made a sound decision that meets your specific needs and nothing excess, I say that is a wise.

No doubt, if the 63 had the spec I wanted and wasn’t pushing the upper end of my budget, I would’ve gone for it!

I was looking at a '24 GT63 alpine grey exterior, red pepper interior, no aero kit, dealer-used with around 800 km. Instead, I went with the '25 GT55 in matte white, white interior, and an aero kit with zero km, for about a $27K difference all in.

Had the GT55 not been a not commonly ordered spec, 1 year newer and fully loaded I without question would've gone for a 63.

Yeah I might even hold off on tuning the car until my warranty is over, then I can just go crazy with tunes lol.

Don't forget you are also one model year newer with the GT 55

That seems like a plan to me.

They are interesting group of gents for sure- the BMW racer (in other vids) is horrible at launching and the Porsche guy does ok. I have been watching them for a bit and I always wonder if they are running cars off a lot LOL.

Interesting, they are a dealership in Canada yet I never came across this youtube channel, usually I watch throttle house drag races and carwow but a MB dealership doing drag races? I like their style, subscribed! Thanks for posting!

100% makes sense- I would have got the 55 but the delta with my discount was very lean (around 14k) so I just sucked it up LOL. Now If I got the 55 I would indeed get the RT box cause, as you mentioned- its pretty easy to pull out and reinstall if needed. My tech did my RaceChip version (its not as aggressive or as aggressive as RT claims) but its only 700 bucks for me. It took him about 45 min to install so do not pay 1k for that job please!! Im not sure where you are located but if in SoCal I can refer you to him or at the least you can get the RaceChip one. Im running RC on my BMW's too- cheap easy bang for the buck tune with a cell phone app to custom change the maps. Think JB4 without the ability to data log or do heavy fuel mods and hardware adds. Its more of a plug, play, and walk away.

They claim 60whp/55tq gains but at the wheels so its more if you adjust to crank like RT does. Its fine for me and now my 63 has the juice!!

https://www.racechip.us/shop/mercede...hoC9IYQAvD_BwE

Different vehicles for different folks, you have some very fun and fast toys in your fleet : ) didn't you even wanted a GT 63 S E Performance because of lack of power (for your needs and wants) on the GT 63? If you go GT 55 you will be begging for power, on the other hand, GT 55 is more than enough for other folks : )

I understand --- my post was to his earlier one about the "consideration" of a tune with the price and labor- thus my sharing of a local vendor with a cheaper yet worthy product along with the cost and install associated.

Its about informing and clearly we know hardly anyone tunes their cars here which is respected of course.

I see : )

Great info! That explains why tuners have the gt63 up in the 7xx hp and the gt55 no where near that. What you've described justifies the cost difference give or take. A lot of people dont realize that to really prepare the internals for bigger hp is very expensive. We all know some companies cheat this and they are the dissatisfied customers with a hole in the side of the block.

For those of us trying to understand the price difference well here it is explained. I am a hp addict so the internals are very important when you plan on taking this platform to 900-1000hp

When the actual internals are different that is when things are more complicated on whether or not it is worth it, obviously it depends on each individual if they need the extra power or even more power through aftermarket tuning but I always thought it was a simple software de-tune, couldn't be any further from the truth.