Let us know! this is some good software

Renntech or kleenman have the same gains? Currently driving c400. Do you have partner in california by any chance?

We would be glad to get this set up either way!

All we would do is take the payment from you for shipping as well as the ECU and then we would send you shipping labels via email.

From there you would pull the ECU send it to us, we would tune it and send it back

only a 3 day turn around time!

Are you interested ?

Everyone would be interested!! I love extra power why not.. My only concern is the warrAnty of the car.. Its 4 months old..

Warranty is not affected as per Renntech. My ECU is already flying to Fla.


Removing the ECU is a no brainer.
1- Disconnect battery, the battery cover is seems attached under the windshield but it can be reflected up enough to remove the negative terminal.
2- Remove engine cover
3- Remove ECU. Its the finned aluminum box on top of the engine. Its tight, but it pops right up.
Remove the connectors from the rear of the box. The larger one is a black pull-tab on the passengers side of the box, the other one it a gray rocker on the back. they are also a little stiff but not to worry.


DONE wrap in bubble wrap put in a box and thats it. You can download the necessary submission forms from the renntech website or simply give them a call.


Installation is exactly the opposite (obviously). Once the ECU is connected and in its place, reconnect battery and your done. Ill let you guys know how it went. I G-timed my previous setup so it should be fairly simple to do so again to confirm gains. The original did 4.8 60 and 107 quarter (on sport plus).
Ill report back when I install mine, hopefully next Tuesday.


One of the issues you should consider is safety related. Unless you have the optional 19 inch rims your car is equipped with H rated all season run-flats, these are limited to 130mph. Once you remove the limiter the car should easily top at more than 150mph maybe even 170. Even limited stints at those speeds on the all season tires could lead to catastrophic tire failure with possible (even likely) deadly results. If you do the upgrade keep your speed under 130 until you replace the tires. The high performance version of the continentals is available on Tire Rack or if you wish some regular Michelin super sports are a good choice and, as usual, much cheaper than the Mercedes OEM tire. So go in with eyes open that the ECU upgrade essentially requires a tire upgrade too.

Wow!! ThankS for this info! Yeah running with Y rated tires! So... warranty is no issue how about when you bring the car for next service.. is there a possiblity that they may reverse REmap.. Sorry if i ask this question am so new on this but i love fast cars! I was born and raised in the country with no speed limit!

I don't think that would be an issue. On thing I learned is that the ECU is actually 2 brains in one (thats why there is 2 connectors) one is engine management, the other controls everything else. The reflash only involves the engine part, thus all other systems are unaffected. Unless an update was issued by MB for the engine management, which is doubtful, your renntech tune should be safe. Renntech also will also work directly with your dealer if the dealer should have any issues that will mess with your tune.

Its nice to know.. thank you!!

I was hoping for more. BMW N54 engines can squeeze more power/torque on their engines with a tune.

The Renntech tune is a mild one 50HP and 55 torque but the great advantage is that the car drives exactly the same as before (except with 15% more power on tap) and doesn't affect FE at all, in fact after driving with the tune for >1000 miles it might improve FE slightly. As others have pointed out its rather expensive, but IMO a tune that keeps driveability intact is well worth the money. Note that its almost twice the improvement of the OEM "AMG tune" in the C450.
335 and S4 owners hate it . Its also a BIG surprise to Mustang GT owners when a non AMG shows them its taillights (twice already )! Mustang owners tend to be a pugnacious group .
One more thing, only Renntech is TUV certified all other tuners results are simply "claims".

Im interested in the tune for the C300. Can you give me numbers increase? Also anyone know what or if there is any differences in the CLA 45amg engine and the C300s besides tune?

The CLA and C45 differ by more than 140 hp I would doubt that its all just a "tune" If it were there would be no need for the V6 twin turbo on the C class. It would be nice if someone could give more info on the extent of mods.

GMP Performance, mind filing us in on this please? Or anyone who knows.

Though its hard to tell, it seems the whole turbo, the crank and other goodies are different. Basically it seems the only stock part is the 2.0L block. The darned thing is boosted to 26 psi!!!


This is what I found:
The All-New 2014 Mercedes-Benz CLA45 AMG Press Information

'Driving Performance' at its Best

March 27, 2013

MONTVALE, NJ – Mercedes-Benz AMG will celebrate its world debut of the
2014 model year CLA45 AMG at the New York International Auto Show. The
four-door coupe follows in the design footsteps of the successful CLS63
AMG, the trendsetter for four-door high-performance coupes. With a
maximum power output of 355 hp and a peak torque of 332 lb.-ft., the 2014
CLA45 AMG is the world's most powerful four-cylinder engine built in
series production. The performance-oriented AMG 4MATIC all-wheel drive
on the CLA45 AMG sets new standards in the competitive segment as well.
The 2014 CLA45 AMG goes on sale in the U.S. this November.

Ola Källenius, CEO of Mercedes-AMG GmbH: "In the CLA45 AMG,
Mercedes-AMG presents a unique and absolutely desirable automobile with
the characteristic AMG genes. The high-tech package with the world's most
powerful four-cylinder production engine and performance-oriented AMG
4MATIC all-wheel drive stands for 'Driving Performance' at its best."
Mercedes-Benz AMG establishes a new segment with the exciting new four-door
performance coupe CLA45 AMG -

Key figures at a glance:

Mercedes-Benz CLA45 AMG
Displacement 1,991 cc
Bore x stroke 83.0 x 92.0 mm
Compression ratio 8.6 : 1
Rated power output (U.S.) 355 hp at 6,000 rpm
Peak torque (U.S.) 332 lb.-ft. at 2,250-5,000 rpm
Engine weight (dry) 326 lbs.
Maximum engine speed 6,700 rpm
Power density 178 hp per liter
Maximum boost pressure 26.1 psi (1.8 bar)
Acceleration 0-60 mph km/h 4.5s (est)
Top speed 155 mph *electronically limited

Pure AMG: the most powerful four-cylinder production engine in the world

The 2014 CLA45 AMG 2.0-liter turbo engine is the most powerful turbocharged
four-cylinder production engine with a maximum power output of 355 hp and a
peak torque of 332 lb.-ft. of torque.

The combination of high power, strong torque and performance-oriented
AMG 4MATIC all-wheel drive lend the CLA45 AMG superb driving
performance. The powerful coupe sprints from 0-60 in 4.5 seconds. Top speed
is electronically limited to 155 mph. Mercedes-AMG achieves these impressive
figures by the use of high-tech engineering throughout the engine and related
systems. The combination of multiple injection and multiple spark ignition
improves fuel utilization and substantially increases thermodynamic efficiency,
leading to low exhaust emissions. Other highlights include the sand-cast all-
aluminum crankcase, weight-optimized crank assembly with forged steel
crankshaft and forged pistons with friction-optimized piston rings, NANOSLIDE
cylinder lining technology, water-to-air intercooling, alternator management
and ECO Start/Stop function.

Twin-scroll turbochargers and AMG sports exhaust system with butterfly valve

Mercedes-AMG masters the essential challenges concerning the response of
small-displacement turbo engines by means of a twin-scroll turbocharger,
minimized restrictions in the exhaust system and an innovative injection
strategy. The twin-scroll technology makes effective use of exhaust gas back
pressure, temperature and momentum to provide a more spontaneous build-up
of boost pressure. This results in a quicker build-up of torque from low revs. As
a positive side effect, the twin-scroll technology also benefits fuel consumption
and exhaust emissions. With a maximum boost pressure of 26.1 psi (1.8 bar),
the AMG 2.0-liter four-cylinder turbo engine also leads the field in this respect.

The AMG performance exhaust system features large pipe cross-sections and
an automatically controlled butterfly valve in the exhaust system. This
technology, which is familiar from the SLK55 AMG, allows the CLA45 to deliver
a commanding roar on acceleration while also offering a refined note during
sustained speed, such as on the highway. The valve is continuously adjusted by
the engine mapping in line with the accelerator input, load status and engine
speed.

It provides for an even more emotional and striking exhaust note when the
throttle is open and when shifting gears. The rev-matching function during
downshifts and the suppression of ignition and injection during upshifts under
full load produce a particularly powerful sound with the AMG Performance
exhaust system creates a level of emotion that is typically reserved for engines
with more than four cylinders.

High-performance cooling system with components from the SLS AMG GT

The high level of driving dynamics of the 2014 CLA45 AMG call for a highly
effective cooling system. Similar to the technology of the SLS AMG GT, a low-
temperature circuit is additionally installed for water-to-air intercooling of the
charge air of the four-cylinder turbo engine. The large radiator at the very front
of the cooling module is supplemented by an additional radiator in the wheel
well. A high-performance electric pump provides the required flow through the
water radiators located behind the large intake ports and the intercooler
connected in line. This provides ideal cooling of the highly compressed charge
air, thereby contributing towards optimum engine performance.

Cooling of the transmission oil is integrated into the hot-water cooling circuit of
the engine. The radiator positioned behind the front fascia is supported by the
heat exchanger, which is fitted directly on the transmission and supplied with
cooling water as required by means of an auxiliary pump.

"One man, one engine": engine production the traditional artisan way

Like all eight- and twelve-cylinder engines, the new AMG 2.0-liter four-cylinder
turbo engine is also hand-built according to the traditional AMG philosophy of
"one man, one engine." An exclusive assembly line has been set up for the new
AMG engine at the Mercedes-Benz engine production plant in Kölleda,
Germany. A characteristic feature of the "one man, one engine" production
process is the AMG engine plate bearing the signature of the responsible
engine fitter. Apart from serving as an AMG hallmark confirming superlative
production quality, the AMG engine plate also attests to the peerless genes of
the Mercedes-Benz high-performance brand.

Well hopefully i can find a good tune and a bolt on or two and get 240 at the wheels. I would be happy with that.

Is there a turbo upgrade for the c300?