Vehicle Fitment

  • 2002–2006 Acura RSX (2.0L K20A3 / K20A2 / K20Z1)
  • 2004–2008 Acura TSX (2.4L K24A2)
  • 2006–2011 Honda Civic Si (2.0L K20Z3)

Features

  • Ultra Series Stage 4 camshafts engineered for high-performance builds
  • Forged tool steel cores for durability and strength under extreme conditions
  • CNC-ground profiles with Fast Ramp and AMAX technology for aggressive airflow
  • Optimized for enhanced mid-range and top-end horsepower gains
  • Seamless VTEC crossover for broad powerband performance
  • Designed to improve throttle response and engine efficiency
  • Ideal for naturally aspirated or forced induction setups
  • Recommended supporting upgrades include high-performance valve springs

Specifications

  • Part Type: Ultra Series Stage 4 camshafts set (intake & exhaust)
  • Material: Forged tool steel core
  • Lift (Intake/Exhaust): ~.575″ / .595″
  • Duration @1 mm (Intake/Exhaust): ~280° / 283°
  • Intake Centerline: Variable; Exhaust Centerline: ~111° BTDC
  • RPM Range: Varied, optimized for performance builds
  • Use Case: High-output street and racing applications
  • Finish: Precision CNC-machined surfaces

Included Components

  • 1x Pair of Ultra Series Stage 4 camshafts (intake and exhaust)
  • Installation hardware as required

Product Description

The Skunk2 305-05-7040 Ultra Series Stage 4 Camshafts are a high-performance upgrade designed specifically for Honda K-series engines found in Acura RSX, Acura TSX, and Honda Civic Si models. Built with forged tool steel cores and advanced cam profiles, these camshafts enhance airflow dynamics to unlock significant gains in mid-range and top-end power. Their design retains valvetrain stability while providing a broader, more responsive powerband.

Featuring Fast Ramp and AMAX technology, the Ultra Series cams optimize lift and duration to improve throttle response and torque delivery throughout the RPM range. The seamless VTEC crossover and robust construction make these cams ideal for performance engines seeing serious use — whether on the street or at the track. Supporting upgrades such as performance valve springs and titanium retainers are recommended to complement this cam set and ensure reliable valve control at higher engine speeds.

Perfect for enthusiasts building high-output naturally aspirated or turbocharged K-series engines, this Stage 4 camshaft set delivers aggressive performance while maintaining drivability. Always verify supporting modifications and professional installation to achieve optimal results.



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