GrimmSpeed Stealth Box Cold Air Intake Black 2015-2018 STI

GrimmSpeed Stealth Box Cold Air Intake Black 2015-2018 STI


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This is the GrimmSpeed StealthBox Cold Air Intake System. This performance cold air intake system is the result of countless invested hours in research and development to provide the performance enthusiast with a proper intake system designed to add power and performance to your vehicle. This intake system is a direct replacement for the highly restrictive factory intake system that leaves plenty of room for improvement. GrimSpeed has provided you with a comprehensive solution that allows your turbocharger to inhale large volumes of air with a clear flow path free of restrictions straight into the turbocharger. 


  • Black finish option
  • CNC mandrel-bend and CNC cut 6061 aluminum intake tube
  • 1/8" thickness intake tube for better thermal control
  • 6061 alloy MAF flange
  • Laser-cut 3/16" thick aluminum mounting brackets
  • Hybrid cold air / short ram design
  • The air straightener dimensionally mimics the factory configuration for accurate MAF sensor readings
  • Low bend angle aluminum tube minimizes restriction while maximizing performance
  • Shielded MAF sensor placement protects the MAF from heat and increases the accuracy of the readings
  • Optimal MAF placement in the design and bend angle of the intake pipe
  • Designed with a heat shield to provide as close as possible ambient temperatures to the filter

  • (1) CNC-bent intake tube with MAF flange
  • (1) GrimmSpeed High-Flow Dry air filter
  • (1) Stealthbox heat shield assembly
  • (3) Hose clamps 
  • (2) MAF flange screws 
  • (3) Pre-cut rubber sealing strips
  • (1) MAF wiring grommet
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