AMR VS JB4
I’ve researched both tuners, AMR ECU TUNE is a little on the pricey side IMO but results seem nice. I’m not very familiar with JB4 and I tried to research as best as I could and found gains to be inconsistent so looking for honest opinions/experience with either tune.
if you had to choose between the two, which would you go with and why?
Thanks in advance
There is a lot of info on different flash companies and JB4.
Lot of opinions and snakes in the water, do you own research and be careful with where the information is coming from. For example flash company XYZ runs/moderates a popular facebook group so you will see their company heavily promoted and others removed or blocked.
Edit:I have no connection with any vendor or reseller. Just an enthusiast trying to help.
People are entitled to their opinion about AMR and there is a lot of bashing recently... but their tune is a great one regardless of their opinion .

Their are draggy results not only on the AMR Performance blog (www.amrperformance.com) but also multiple on the @amrperformance instagram.
1. OP didn't ask for data. He asked for opinions. This is mine.
2. I'm really not at all interested in their draggy results. What does interest me is their lack of transparency and their censorship. That speaks volumes.
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There are hundreds of thousands of parameters in the ECU that can be touched with software and not by a piggyback. A piggyback cannot alter ignition timing, cam timing, speed limiter, torque limits, failsafes, etc. All it does is focus on boost, which will it give it a slight gain? yes, however, it is not fully optimizing the car to its full capability.
AMR offers a sleek touchscreen handheld that allows you to:
- Choose between 6 pre loaded maps
- Receive free updates
- Save on re-tuning fees due to the maps provided
- Unmarry/Uninstall from the vehicle and re-sell in the future
Again, it all depends on what you are looking for (nothing against piggybacks or any other products, these are all just facts). With AMR, you are getting a full ECU upgrade that gives you up to 100hp AT THE WHEELS with the option of financing and return of investment in the future. Even if it is slightly more expensive, it is a bargain and a half.
In terms of cost, I came from the old school days where a full exhaust was 1200-1500 for a mandrel exhaust and maybe 5-10whp gains. So when I started researching tunes, I noticed tune pricing for 100whp gains resonable IMO. Today's computers are so much more sophisticated. Therefore the tunes including the piggybacks, have to be too. However, tunes have much more to navigate with all the sensors.
I’ve researched both tuners, AMR ECU TUNE is a little on the pricey side IMO but results seem nice. I’m not very familiar with JB4 and I tried to research as best as I could and found gains to be inconsistent so looking for honest opinions/experience with either tune.
if you had to choose between the two, which would you go with and why?
Thanks in advance
Go download the Dragy App. You will see that the a lot of the JB4 tuned C43s on the 1/4mile leaderboard. Most of the JB4 C43s trap anywhere from 11.5-11.8@116-118mph with JB4 alone.
My GLC43 had a JB1, before JB4 was available, and I did 12.7@109 with 2 additional passengers and bad tires in 70% humidity.
If you add a downpipe, without a cat, you'll need a flash. If you add turbos, or do things that need serious fuel, you'll need a tune. Even then, the JB4 provides value. It's more than just a "slight gain", and it has been for a while. Even when things aren't going well, such as the facelift, they kept working to figure out what was going wrong. The end result wasn't the JB4, it was the new MB hardware being unwilling to hold boost like the old platform. Since then, they've fixed it and numbers look comparable.
Lately the roads are empty and almost everyone wants to showoff.
The day before, I had a Julia Quad catch up to me and wanted to run. I was doing around 50mph when we both hit it. We were side by side until I backed off around 100, I didn't want to miss my exit.
Similarly yesterday, a blacked-out debadged model3 caught up and wanted to run. From around 50mph, the Tesla immediately jumped by a nose, but I was able to reel him back and slowly gain on him. A little a head, we ended up at a red light next to each other. I timed the light where I was able to quickly double foot it with out allowing him to take the jump. We were even in first, but he gained about a foot when my car shifted into the next gear, but I gained it back +some, by 3rd gear I was a nose a head of him and slowly gaining. We called it off mid 4th when he was 1/2+ car behind and falling back.
Here's another one from a few months back
https://mbworld.org/forums/c450-c43-...ml#post7921139
All on Map2 and 93 octane.
I just hope it's been updated to work optimally with facelift specs.
I ordered from Mike at N54 Tuning in Mississauga Ontario the following
2015+ C-Class Mercedes-Benz JB4 .. P/N 201GPW2O94
plus Blue tooth connect kit
plus USB Cable
https://www.burgertuning.com/product...8b18cf59&_ss=r
Stock C450 here before I just received and installed the JB4; night and day with map 2/3 running 93 oct. Still playing with the maps (tunes), logging, and driving difference/experience. Feels like a new car, much stronger, and plentiful in power.




.. more than once.
