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MuchBoost 1.8 20V K03 Upgraded Turbocharger with a Custom Billet Compressor Wheel and Enlarged Turbine Wheel. It is based on an original KKK K03, which means that the installation is 100%P&P. The turbocharger is meant to work with cars using the 1.8T 20V transverse or longitudinal engines.

The turbo delivers up to 137% power (120 extra HP) over the factory specs. It is a great choice for someone looking for a bit extra HP from their daily driver. MuchBoost turbo allows you to get more from your engine and enjoy it even more than you’ve been so far.

We have developed 2 modification options that allow you to reach anywhere from 250HP to 300HP.

MuchBoost 1.8T K03 250

Upgraded turbocharger with an estimated ~250HP at the crank. List of modifications:

  • Precisely machined seal plate and compressor housing,
  • Genuine KKK compressor housing,
  • Genuine KKK bearing housing,
  • Genuine KKK exhaust manifold,
  • Upgraded journal bearings system that allows the turbo to hold more boost,
  • More efficient and larger Billet Compressor Wheel 6+6 Blades,
  • Clipped and Lightened genuine Turbine Wheel,
  • The compressor and turbine wheels are balanced separately, and then the whole core is high-speed balanced using VSR balancing machines at speeds similar to the level seen in the vehicle.
MuchBoost 1.8T K03 300

Upgraded turbocharger with an estimated potential of ~250HP at the crank. Modifications compared to the 300 option are the same except:

  • Bigger Compressor Billet Wheel 7+7 Blades*,
  • Larger High-Flow 9 blades Turbine Wheel,
  • Genuine reinforced actuator,
  • Precisely machined Exhaust housing

* Please realize, that the 300HP option requires a bigger diameter of the intake pipe.

Other Significant Modifications

To fully utilize the potential of this hybrid turbo, we recommend upgrading i.a. fuel, exhaust, cooling systems, and the clutch. Individual ECU remapping is the foundation.

You may also like

1.8T De-Cat Downpipe KKK K03 for Audi A3 8L, VW Golf MK4, Seat Leon I, Skoda Octavia I

Hard Pipe Inlet Kit for 1.8T 20V Audi S3 8L/A3 8L/A4 B5, Audi TT 8N, Seat Leon Cupra I

 


A set of gaskets is included with every option you choose!


Cars

Audi A3 1.8T 8L 150HP
Audi A4 1.8T B5 150HP
Audi A4 1.8T B7 163HP
Audi A4 1.8T B5 180HP
Audi A4 1.8T B6 190HP
Audi A6 1.8T C5 150HP
Audi A6 1.8T C5 180HP
Seat Alhambra 1.8T I 150HP
Seat Cordoba 1.8T I 156HP
Seat Ibiza 1.8T III 150HP
Skoda Octavia 1.8T mk1 150HP
Skoda Superb 1.8T I 150HP
VW Beetle 1.8T 150HP
VW Bora 1.8T 150HP
VW Golf 1.8T mk4 150HP
VW Passat 1.8T B5 150HP
VW Sharan 1.8T I 150HP


Factory numbers

5303 988 0044
5303 970 0044
5303 988 0011
5303 970 0011
5303 988 0035
5303 970 0035
5303 988 0026
5303 970 0026
5303 988 0005
5303 970 0005
5303 988 0025
5303 970 0025
5303 988 0029
5303 970 0029
5303 970 0073
5303 988 0073
5303 950 0045
5303 970 0013
5303 988 0013
5303 710 0502
5303 970 0022
5303 988 0022
5303 988 0049
5303 970 0049

Engines

AEB, ANB, BEX, AVJ, AJL,
ARK, APU, BFB, AJH, AWC,
AJH, CFMA, AGU, ALN, ARZ,
AGU, AVC, APH, AJQ, AUQ


OEM number

058145703L
058145703HV
058145703HX
058145703C
058145703CV
058145703CX
06A145703HX
06A145703LX
058145703B
058145703BX
058145703LX
058145703BV
058145703D
058145703DX
058145703DV
06A145703H
06A145703HV
06A145703L
06A145703LV
058145703LV
058145703E
058145703EV
058145703EX
058145703H
06A145703C
06A145703CX
06A145703CV
06A145704L
06A145704LV
06A145704LX
06A145703A
06A145703G
06A145704
06A145713J
06A145713JX
06A145713JV
06A145703AV
06A145703AX
06A145703GV
06A145703GX
06A145704V
06A145704X
06A145703B
06A145703BX
06A145703BV
06A145701
06A145701X
06A145701V


(If your engine has a different code, please send us a message. We will verify it.)


Matters you should be aware of when placing your order.
    1. The warranty is 12 months without the limit of mileage.
    2. We need about 7 working days to perform and ship the upgraded turbocharger. The parcels in European Union are shipped via DPD for just 25,00 EURO. DHL Express (airplane shipping)  is used for orders besides the EU, it costs 99,00 EURO. The average delivery time is 2-4 working days. 
    3. Every parcel is fully insured.
    4. If you didn`t find the turbo you need, feel free to contact us. We are able to perform many more upgraded turbochargers than you can find on the site. Our development department works permanently on the new models.
    5. Do you have a workshop, are you an influencer or seller of tuning parts? We are open to cooperation by offering discounts and refunds.
    6. During placing your order, please provide information as follows:
    • the engine code,
    • the car model,
    • the stock power,
    • the VIN number

These details are helpful to make the turbo correctly. 

POWER RANGE

250HP, 300HP

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