Description

K04 Turbocharger Upgrade for VW 1.8T MK4 Models The K04 turbocharger is a proven performance upgrade for the Volkswagen Golf GTI, Jetta GLI, and other MK4 1.8T turbo engines . Designed to replace the stock K03 turbo, this K04 turbo upgrade delivers significantly higher airflow, faster spool, and improved boost pressure—supporting builds up to 300 HP with proper tuning and supporting mods . Precision-engineered with upgraded compressor and turbine wheels, this VW 1.8T K04 turbocharger provides strong mid-range torque and sustained top-end power while maintaining daily-drivable reliability. Ideal for street and performance applications, it offers OEM-style fitment with race-inspired performance. Key Features & Benefits High-performance K04 turbocharger upgrade Supports up to 300 horsepower with proper tuning Faster spool and improved throttle response vs K03 Upgraded compressor & turbine wheel design OEM-style fitment for MK4 1.8T engines Built for durability under high-boost conditions Ideal for street and performance builds Engine Compatibility VW 1.8T Turbocharged Engines Vehicle Applications Volkswagen Golf GTI MK4 Volkswagen Jetta GLI MK4 Other VW/Audi 1.8T turbo models (fitment dependent) (Professional tuning required for optimal performance) Frequently Asked Questions – K04 Turbocharger What is a K04 turbocharger? The K04 turbocharger is a performance upgrade over the factory K03 turbo, offering increased airflow and higher boost potential. How much power can this K04 turbo support? This K04 turbocharger can support up to 300 horsepower with proper tuning and supporting modifications. Will this K04 turbo fit my MK4 1.8T engine? Yes, it is designed for VW Golf GTI and Jetta GLI MK4 1.8T turbo engines, but fitment should always be verified. Is tuning required after installation? Yes, ECU tuning is required to safely achieve performance gains and maximize turbo efficiency. Is this suitable for daily driving? Yes, with proper tuning and maintenance, this K04 turbo is suitable for daily driving. Does this include installation hardware? Included hardware may vary. Please verify what is included before installation.