LNF K04 Turbocharger Re-Build / Upgrade Service

As many of the Borg Warner K04 Turbochargers have been in service for 10+ years they are developing seal leaks and excessive “blow by”. Refresh your turbo…don’t replace it… A factory GM replacement K04 can cost upwards of $1100+, let RPM re-build…heck… Upgrade your K04 turbocharger!

Our standard rebuild package consists of:

  • Full disassembly of your turbocharger
  • Full Acid cleaning of both the Turbine and Compressor housings
  • Inspection of the internal recirculatory valve (BOV)
    • If valve needs to be replace a $99 charge may be assessed
  • Inspection and testing of wastegate to ensure it operates with in factory tolerances
    • Wastegate is bench tested to open at 6-8psi
  • Replacement of the Center Housing Rotating Assemblies (CHRA)
    • Digital shaft balance to 120k RPM’s
  • Full Re-assembly of Turbocharger
    • Upon re-assembly all components are assembled and “clocked” to OEM specifications.

Sending in your K04 for a re-build, why not upgrade it to our RPM-K04 specs

  • Upgrade service includes all of the basic service’s
  • New 60mm Billet Wheel
    • Digital shaft balance to 120k RPM’s
  • Compressor Housing is machined to accept the larger billet wheel and ported for superior airflow.


LNF K04 Turbocharger Re-Build / Upgrade Service


  1. Remove your Factory Turbocharger
  2. Place it in a sealed bag (platic trash bag works well)
  3. Pack well in a USPS Large flat-rate box (3day or less for $13.80)
  4. Once received at RPM-Motorsports we will issue a received and Ticket Number
  5. Rebuilds are typically turned around in 3 business days or less
  6. RPM will return the finished Turbocharger to the return address via USPS Priority Mail (3days or less)