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Customer reviews
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”Very satisfied. For the first time i'm almost down to 0.5L/10km. And the car lost traction when i accelerated in first gear!“

– Alfa Gulietta

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”Went home with 265HP, came with 224, and saving over 10% fuel as well!“

– Mercedes Viano

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”Came with 116HP. Drove home with 153, and also about 30% more Nm from the bottom.“

– Toyota Previa

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”Hello. New fuel record 400km drive without even trying. Down from 0,54 to 0,5 per 10km. Much more comfortable driving with less shifting and better low end torque. Not to mention it's awesome to feel that extra kick when stepping on it! Thanks for job well done!“

– Berlingo HDI

Find your car
New car -50%
RXT Ultimate
Tractor / boat
Installation
bestchip.eu / Bilmerker / Mercedes
Selected car

Mercedes S -Class (W221) S450 CDI seit 2009

3996 ccm - 235 kW (320 HK) - 730 Nm

Depending on which engine you have in your vehicle, you have different chiptuning alternatives. You have 4 alternatives for your Mercedes S -Class (W221) S450 CDI seit 2009. Please confirm that you have selected the correct engine from the car list. These are the alternatives for -Class (W221) S450 CDI seit 2009 with 320 HP. The product images are illustrative and colors may vary from actual product.

Choose chip type. The price includes customs, taxes and fees, no surprises!
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Alternative 1

Speed

Speed

Spped technology - more power!

EUR €289
yes In stock
Effect with chip
396 HP ( +24%)
Torque with chip
875 Nm ( +20%)

Alternative 2

Ultimate

Ultimate

Our top model, most power and durability with quality electronics and remote control included for on/off.

EUR €369
yes In stock
Effect with chip
403 HP ( +26%)
Torque with chip
894 Nm ( +22%)

Alternative 3

RXT Ultimate

Set of both Ultimate and RXT Power Booster. Maximum effect and fuel savings controlled from your drivers seat.

EUR €459
no Preorder! Coming soon!
Because of the global shortage of components we haven't been able to obtain enough of this product and may be out of stock.
Effect with chip
409 HP ( +28%)
Effect about 320 HP at 50% throttle

Product comparison

Speed

yes World's smallest design?
yes Car switch warranty (-50%)
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yes Engine warranty
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yes 100% satisfaction: 30 dager
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yes Fuel savings: 5 - 20%
yes Eco-boost program
yes Water proof
yes Motor Protection System
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Ultimate

yes On/off switch
yes World's smallest design?
yes Multiple engine connections
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yes Best processor on the market
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yes Car switch warranty (-50%)
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yes Engine warranty
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yes 100% satisfaction: 30 dager
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yes Fuel savings: 5 - 20%
yes Eco-boost program
yes Water proof
yes Motor Protection System
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RXT Ultimate

yes {PatentedIntegration}
yes World's smallest design?
yes Multiple engine connections
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yes Best processor on the market
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yes RXT Power Booster
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yes Car switch warranty (-50%)
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yes Engine warranty
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yes 100% satisfaction: 60 dager
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yes Fuel savings: 5 - 20%
yes Eco-boost program
yes Water proof
yes Motor Protection System
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