GrimmSpeed StealthBox Cold Air Intake Black - 2015-2018 Subaru STI
GrimmSpeed StealthBox Cold Air Intake Black - 2015-2018 Subaru STI
GrimmSpeed
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Every product is sourced from authorized manufacturers or distributors. If something isn’t right with fitment or condition, we’ll work with you to resolve it fairly.
NO GUESSWORK,
JUST PARTS THAT WORK.
Let’s finish that car.
PRODUCT DETAILS
RallySport Direct proudly carries a great selection of quality aftermarket performance products brought to you by GrimmSpeed.
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.
DETAILS:
- 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
CONTENTS INCLUDE:
- (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
WHY WE CARRY THIS
We only list parts we’d run ourselves or recommend to a friend building a real car. If it feels vague, unverified, or inconsistent, it doesn’t make the cut.
- Fitment-first mindset — no “universal” roulette
- Brand reputation matters — we favor proven manufacturing
- Support that actually responds with real answers
WHAT TO EXPECT
This is the clean path: correct fitment, clean install, and results that match the intent.
- Install-ready experience with correct mounting where provided
- Finish that holds up to real driving, not just photos
- Selections on this page drive the exact fitment shipped
TRUST, BUILT INTO THE PROCESS.
Anyone can list parts. We curate what belongs on a serious build. Our goal is simple: fewer surprises, cleaner installs, and confidence when you hit “Buy.”
Fitment checked
We prioritize vehicle-specific listings and clear selection logic so you’re not gambling on compatibility.
Brand discipline
Proven manufacturing and consistent quality matter more than hype. We bias toward what actually holds up.
Real support
If you have a question, you’ll get a human answer that helps you finish the build — not a copy-paste shrug.
RallySport Direct proudly carries a great selection of quality aftermarket performance products brought to you by GrimmSpeed.
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.
DETAILS:
- 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
CONTENTS INCLUDE:
- (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
