K03 vs K03s & K04 Performance Tuning [Upgrade Tips]

We take a complete look at the K03 K03s and K04 turbos as used by the VW Audi group in Seat, Skoda, VW & Audi models of car including the Golf, A3, A4, Passat, Leon, Cupra, Exeo, Superb, Fabia, Yeti and anything that came with an early 1.8T engine or 2.0TFSi engine.

We compare the K03 K03s and K04 and look at swaps, power limits and best mods and upgrades for these.

{Please note the power limits stated in the video for the K04 are somewhat over cautious. I have revised my opinion based on feedback and now view the safe limit around 250hp and the max is around 280-300 depending on the engine it is fitted to.}

We also look at the N75 and what it does and why you will get problems if you fit an atmospheric dump valve to these engines.

https://www.torquecars.com/volkswagen...
https://www.torquecars.com


Articles and videos sourced and referenced in this video.....

https://www.torquecars.com
https://www.torquecars.com/audi/tfsi-...
https://www.torquecars.com/volkswagen...
https://www.torquecars.com/volkswagen...

   • Best 1.8 TFSi & 2.0 TFSi Tuning  Mods...   EA888 Mod guide
   • K03 vs K03s & K04 Performance Tuning ...   Turbo guide (k03 k04)
   • Best 1.8T 20V Tuning  Mods [Seat, Aud...   1.8T Tuning guide (pre TFSi)

Footage Credits
iStock,com/cinejinn
British Motor Museum
StoryBlocks