Why Is This CLS550 So FAST??? 

Thank you for putting up this review. I have been searching for the very review you did for the Renntech ECU mod for this engine. Nothing close to your detailed review. I have the same engine in my '12 E550 Cabriolet. I've been considering the upgrade for it but wanted more info. Thanks again for a job well done.

Before AMG was a factory option they were an independent tuning company who sold AMG cars from their own facility. In Germany if you make extensive mods (engine, tranny, suspesion etc) to a vehicle, the tuner get have their brand recognized as an independent manufacter hence AMG. MB had no affiliation with AMG during this period. AMG was founded by 2 partners and when MB purchased the company the 2 AMG partners broke up.....1 of the partners went on to form Renntech.

I’m seeing these for 19-24k now I’m about to check it out

I have a '13 CLS550 4matic with the updated Renntech tune, the updated plugs, air filters, and the Renntech exhaust, on 265/20s in the front and 295/20s in the rear. Absolute rocket. Needed more aggressive pads on the brakes. Great review.

one of the best overall reviews yet, i have a 14 CLS 550 and have seen about every other review, yours are real and to the point excellent job !!!

I’ve watch many videos and kept passing this up for some reason. Mad I didn’t check it out first. Thanks Man. Going to tune my 2014 E550 coupe when I get 1.

Just bought my 2014 35,000 mile CLS 550 in Diamond White and Sport Black seats. I avoided the 2015 and newer models because Mercedes screwed up the styling after that.

Probably one of the best cars ever made! Still pre all the overly dramatic downsizing and not too much tech in the car. This seems like the sweetspot era for modern cars. Also it’s wildly beautiful, people love the looks of it. Even non car people, that says something.

My 2012 cls550 4matic stage 2 has 485hp 650tq at the wheels and very reliable I love it

I can only imagine a 63 car. I have a ‘13 gl550 and it hauls for a pig. Plenty of power and feels so good to drive. I would love to have a CLS 63 or a S 63. Good video man!

Excellent review and Intel on the mod.

😂😂that was the wildest description I’ve heard for those taillights. I’ve always thought they are amazing the way they look

I’m currently in the process of selling my stage 2 cls550 2014 and I keep watching these videos and it’s lowkey making me not want to sell mine. I’ve watched this specific video way too many times in the past month or so😭😭

Good review 👍 I'm a big fan

Does trans, driveshaft, or other drivetrain need upgrade? Or is it fine stock with tune? I see this ? Asked a lot here but no answer.

Really a great video on the CLS 550. You sold me on getting 540HP Tune.

Thanks for this post bro

This video is awesome. I had no idea the ECU tune existed, for such a reasonable price!

How’s the transmission holding up?

What does it do for gas mileage......and would the tune effect the longevity of the vehicle

Good stuff!!

Nice video....I have a CLS 63 AMG....I'm going to get my machine a RENNtech Upgrade...next week....!

Keep up the good work

Well done man! I have a Renntech 2014 ml550 and its no joke, ANY 550 should be Renntech. Most gains of any Mercedes for just ECU tune. (just ask them yourself) first post i have ever made so i hope it works as well as my Renntech!

Great review

How much does it cost to upgrade to renntech??

Thanks for sharing.

Great description of this car.

looking to get a 2012 for around 21-25k and looking for tunes ahead of time and came across renntech and it seems unreal to me. More than willin to pay almost 3 k for this but the only thing that worries me is the reliability of a cls with 90k+ miles with this tune.. subscribed btw awsome video

Great video!!!

Do they have transmission tunes for the 550?

Hey, does the tune deal with the usual Mercedes throttle delay? Hopefully, that would keep me from buying one, this is one of the worst brands for this issue. Hopefully the tune fixes it. Thoughts?

Where did you get the car tuned

Very nice video!

what's the best tune for 2008 cls550

mercedes has a lot of motors that are detuned. I too like the 4.7 variant for the stock psi on the turbos are very low which allows a simple tune to produce big results. in a car that's 4500 lbs the torque is more important than the hp so yes the 700 ft pounds really moves that heavy mass. My brother has the 4.7 in his 13 sl and he has 150,000 miles on the car without any problems. A great motor and a simple upgrade with big results! thnx

What are the rims?

Do u know how much that tune may run?

is there downpipes on the vehicle

Nice video my man...you convinced me Renntech. My 2014 CLS550 is my favorite car of all time. Just got rid of my Corvette and have a need for speed :)

I’m doing this build on my channel. Not sure what kind of tune to do if anyone has any ideas lmk !

I live in Atlanta & plan on doing it to my vehicle

Great Review of the CLS...I just subscribed to the channel! 👍🏿

Hey Bro, Nice post. Can you post a link on who performed your tune? Thanks!👍🏾

Excellent review... I'm on the fence in deciding between the 550 and the CLS63, and this helped.

Is this just for 4matic?

Disagree about the taillights looking feminine. It looks sharp and aggressive much better looking than the later model mercs. Dont want to replace my merc coz the new ones look like Mazda taillights

Does it have a lot of torque?

How reliable is the tune? Have you ever had to take it back to be re-flashed?

What are the wheels on this car?

Did the tune. Drove up to Stuart Florida, RENNtech HQ and watched Pat there do the OBD tune for the first time on my car. In short, it’s quite brutal. It’s actually too fast for public roads. After only a few seconds you’re going way over posted speed limits. It becomes dangerous to the driving public, unless you’re on empty roads…. Okay, a track.

I'm considering buying a 2013 CLS 550. Can any reputable shop with a Dyno do a tune?

Bout to cop one for a weekender got 2016 w212 350 for the daily

Am i reading this correctly, the tune takes you from 402hp to 540hp??

Nice cars. I love my cls 63 amg at 700 horse. She will roll.

After reading the tune description on the RENNTECH website, I noticed you have to use 93+ octane on that specific tune. Do you adhere to that or are you running standard premium? As states in the notes section below the the tune..."Our numbers will be dependent on conditions and fuel quality. 93+ Octane gasoline is mandatory with this Performance Upgrade. States known for poor fuel quality have to be supplied with a lower power setup. Please call for details and Race fuel options." This is what's holding be back from the upgrade. Thoughts???

I may go to Mercedes of Buckhead, as well, for my 2012 CLS550. I spoke to Kevin Ingold at their speed shop and he quoted me $3,400 for the ECU tune and installation along with warranty. I called RENNtech in Miami and they told me the ECU tune will shave a 1/2 second off of the 0-60 time and the speed limiter would be bumped to 186mph, which happens to be the tire's speed limit of the Y-rated Continentals. So the 0-60 time should improve from 4.9sec to 4.4sec. Insane. Does the gas mileage stay the same, if you drive normally?

How much was the tune? Did you even say how much it was?

Cool video bro 🤙🏻 now I make my mind what to get thanks. Hey do you have a video for the Air Intake? Or can you make one so I can see what you talking about and what brand when I buy my Mercedes CLS Thanks and God bless 🙏🏻

The ls460 made almost 400 hp with na 4.6 . What can you ask for more ? My 550 has similar power but has twin turbo so I really think Mercedes didn’t do too well with this .

When u flew back into the seat I got a sense of how much torque...this car is a monster

Renntech or MRE?

Is that car expensive to maintain?

Hes right

Kinda remind me of the rs7

plz more videos of this cls

What is the renntech upgrade and how Much does it cost?

I bought a 13 cls550 4matic cpo with additional 2 year warranty I wanna get the Renntech tune I'm just wondering will it void the cpo warranty I look online and they say no matter what tune u get it voids the warranty is that true?

Any idea on 0-60 times or 1/4 mile, renntech hasn't posted any real numbers on the site besides power. Thanks great video btw.

Bro we’re trying to see the car not you lol 😂

whats the 0-60mph with the tune?

Are you in Albany? All of those houses look familiar

And you can get more hp out of that engine, I have a 14 E550 cabrio and it has 516whp, only tune & exhaust. Stock down pipes, stock intercooler, stock turbos.

12:32 - 12:55 that's deep #AMG

Four door coupe of sedan ? 🙃🤪

Im in New York ... you think my local dealerships will do the tune?

Maybe I missed it in the video. How much was the Renntech performance upgrade?

Thank you for the review, but is it a good daily driver car

yes 35-160 mph 11 seconds

but how much does the tune cost?

Pulls like a train 🤔 I once saw a train pull and it was like the slowest ever lol

Is this car expensive to maintain

This car does not make 500hp with a tune even it was crank hp with a stage 2 it’ll only make between 380-410whp

Ummmmm...driveshaft upgrade??? Diff. upgrade??? The driveshaft & diff. on a 63 or 65 was engineered to handle all that torque. A CLS550 or SL550 have a driveshaft and diff that is not the same as a 63 or 65 driveshaft and diff. You're talking about 200 to 250ft lbs increase from the original torque specs.

No offense, but one thing that just pisses me off about people who say this. "It's not a sports car by any means" Yeah, it just has a twin turbo V8 and is faster than most sports cars.

Bro the Quality wasn't the best Maybe it's me because I watch on a i mac 5k

The intro unnecessarily long

A 4door coupe 😂

stop talking bruh and show us the damn thing fly!!

Car looks feminine?! you sound a little feminine 😂

Hhhhhmmmmmmm...... Lexus LS or GS350 ?

less talking, show more of the car..do not want to see a video of you .

Why the fuck do black people love CLS's and 6 series BMW's?!?!?! I don't get it. Please explain. Is it because they are flashy and not necessarily car enthusiast cars?