Best Cold Air Intakes for the Subaru WRX (2015-2021)

The 2015-2021 Subaru WRX runs a turbocharged FA20DIT — a boxer-four that responds well to airflow improvements, but only if the intake actually pulls from cold air rather than recycling heat soak off the turbo and exhaust manifold. The factory airbox is conservative by design: Subaru prioritized noise suppression and fuel economy over peak VE. Swapping it out is one of the highest-return bolt-ons you can do before a tune, and on a tuned car, a quality intake + heatshield combination consistently supports 5-10 whp gains on a proper dyno pull. What separates the good from the wasted money: sealed or heatshielded filter placement, velocity-optimized tubing diameter, and a filter that doesn't require constant maintenance or sacrifice filtration for flow. Here's what's actually worth buying.

Quick Links

• 1. PERRIN Cold-Air Intake w/Heatshield — Red
• 2. PERRIN Cold-Air Intake w/Heatshield — Neon Yellow
• 3. Injen SP1209WB Wrinkle Black Cold Air Intake
• 4. aFe Takeda Stage-2 PRO DRY S
• 5. aFe Takeda Stage-2 PRO 5R
• 6. Cobb SF Intake + Airbox
• 7. Mishimoto Performance Cold Air Intake
• 8. K&N Typhoon Air Intake
• How to Choose a Cold Air Intake for the WRX
• FAQ

1. PERRIN 15-21 Subaru WRX Cold-Air Intake w/Heatshield — Red (PSP-INT-325RD)

PERRIN PSP-INT-325RD — $389

PERRIN's WRX intake has been a forum-recommended staple for years, and the 2015-2021 version earns that rep through real engineering rather than brand loyalty. The included heatshield is the deciding factor: it isolates the filter from underhood heat, which is exactly where most cheaper intakes fail on the FA20. Mandrel-bent tubing, proper velocity stacking, and direct fitment with no adapter hacks make this a strong first intake on a stock or mildly tuned car. The red finish reads clean in the engine bay against OEM black plastics.

2. PERRIN 15-21 Subaru WRX Cold-Air Intake w/Heatshield — Neon Yellow (PSP-INT-325NY)

PERRIN PSP-INT-325NY — $406

Mechanically identical to the red version above — same heatshield, same tubing geometry, same filter spec — just finished in PERRIN's signature neon yellow, which has become a recognizable aesthetic in the WRX community. If your build runs yellow accents or if you want the intake to be a visual statement under the hood, this is the pick. The slight premium over the red is purely cosmetic; the performance is the same.

3. Injen 15-21 Subaru WRX 2.0L Wrinkle Black Cold Air Intake (SP1209WB)

Injen SP1209WB — $481

Injen's SuperNano-Web dry filter technology makes this a compelling option for WRX owners who want the performance of an oiled filter without the re-oiling interval or the risk of MAF contamination — a real concern on the FA20's sensitive air metering. The wrinkle black powder coat is durable and looks intentional on a blacked-out build. At the higher end of the price range here, you're paying for the dry-filter advantage and Injen's California-designed airflow optimization for this specific application.

4. aFe Takeda Stage-2 PRO DRY S Cold Air Intake — 15-18 WRX (TA-4305B-1D)

aFe Takeda TA-4305B-1D — $428

The PRO DRY S filter is aFe's no-oil synthetic media — excellent filtration efficiency, zero maintenance oil cycles, and no chance of over-oiling fouling the MAF sensor. This is the version to run if the car sees track days, autocross events, or you simply don't want to think about filter maintenance. Note the 2015-2018 fitment window — if you're on a 2019-2021 chassis, verify your specific build before ordering. Stage-2 designation means the tube diameter and filter sizing are optimized for modified airflow, not just OEM replacement.

5. aFe Takeda Stage-2 PRO 5R Cold Air Intake — 15-18 WRX (TA-4305B-1R)

aFe Takeda TA-4305B-1R — $417

Same Stage-2 housing and tube as the DRY S above, but running aFe's PRO 5R oiled cotton gauze filter — the higher-flow option that pulls slightly better numbers on a well-tuned dyno run. The trade-off is periodic re-oiling and more careful application to protect the MAF. For street-only builds chasing peak numbers and willing to maintain the filter properly, this is the pick over the DRY S. Same 2015-2018 fitment caveat applies.

6. Cobb SF Intake + Airbox (715300-BK / 715300-BL)

Cobb SF Intake + Airbox — Black (715300-BK) — $556 | Blue (715300-BL) — $556

The Cobb SF system is the only intake here that includes a full enclosed airbox — not just a heatshield, but a sealed housing that genuinely isolates the filter from underhood heat in the way a true cold air intake should. That matters especially on the FA20 where turbo heat soak is real. It's the premium option for anyone running Cobb's OTS or custom map ecosystem, where intake compatibility and consistent air metering behavior are critical to tune stability. Also available through Cobb's own intake system at Black (SUB00002IA-BK) — $611 and Blue (SUB00002IA-BL) — $611, which bundle additional components for a complete system.

7. Mishimoto 08+ Subaru WRX/STi Performance Cold Air Intake Kit

Mishimoto Wrinkle Black (MMAI-STI-08WBK) — $374 | Wrinkle Red (MMAI-STI-08WRD) — $376

Mishimoto's intake covers 2008+ WRX and STi — meaning it spans GR/GV into VA generations with the same fitment. The wrinkle-finish aluminum piping is robust and looks the part, and Mishimoto's lifetime warranty covers the kit outright. The entry-level price point makes this the move for a first build or a daily that isn't getting mapped anytime soon. Not the most aggressive flow numbers in this lineup, but legitimate cold air positioning and solid real-world ownership feedback documented across WRX forums.

8. K&N 18-19 Subaru WRX 2.0L Turbo Typhoon Air Intake (69-8011TTK)

K&N 69-8011TTK Turbo Typhoon — $386

K&N's Typhoon system is narrower in fitment than most here — specifically 2018-2019 — but within that window it's a polished, fully engineered kit with K&N's high-flow oiled cotton gauze filter and a mandrel-bent intake tube optimized for the FA20's revised airbox routing on the facelift car. K&N's warranty and filter maintenance program are well-documented. If you're on an 18-19 WRX and want a brand with decades of proven intake data, this is a credible pick at a competitive price.

How to Choose a Cold Air Intake for the 2015-2021 WRX

Heatshield or enclosed airbox — non-negotiable on the FA20. The FA20DIT's turbo and exhaust routing put real heat into the engine bay. An open-element intake without thermal isolation will pull hot air on a hot lap or a hard pull, erasing the gains and potentially causing knock on a tuned car. PERRIN's heatshield and Cobb's full airbox are both valid solutions; open-element shortram designs are not.

Oiled vs. dry filter. The FA20 runs a MAF-based air metering system. Over-oiling a cotton gauze filter is a legitimate risk — it contaminates the MAF wire and causes fueling errors. If you're not meticulous about filter maintenance, the aFe Takeda PRO DRY S or Injen's SuperNano-Web dry filter eliminate this failure mode entirely. If you're careful and chasing peak flow numbers on a built and tuned car, the oiled options (aFe PRO 5R, K&N) are fine.

Fitment year range matters here. The 2015-2021 WRX received a mid-cycle refresh in 2018 that slightly altered airbox routing. The aFe Takeda options are specifically 2015-2018. PERRIN, Injen, and Cobb cover the full 2015-2021 span. Double-check before ordering.

Tuning compatibility. Any intake on a tuned FA20 should be selected in coordination with your tuner. The Cobb SF system is the natural pairing with an AccessPort OTS or custom map. PERRIN and Injen have known OTS map pairings on Cobb's map database. Running a non-supported intake on an OTS tune can cause MAF scaling errors.

Beyond the intake, a well-built WRX benefits from complementary wheel and suspension work. Browse ThreePiece.us wheels, check fitment with our suspension catalog, and read our WRX STI Generations Ranked piece for context on where the VA sits in the lineage. Also relevant: our Best Cat-Back Exhausts for the 2015-2021 WRX guide pairs directly with intake work on a staged build. For broader JDM performance context, the WRX STI History guide is worth a read. If you're modding the VA with wheels too, see the Subaru 5x114.3 fitment guide and our Subaru Crosstrek Wheel Fitment Guide for platform-adjacent fitment data.

FAQ

Do I need a tune after installing a cold air intake on the 2015-2021 WRX?

Not required for a safe street drive, but recommended to realize the full benefit. The FA20's ECU will self-correct via MAF feedback within limits, but a proper tune — OTS or custom — optimizes boost, timing, and fueling to match the increased airflow. Without it, you're leaving power on the table.

Will a cold air intake void my Subaru warranty?

Under the Magnuson-Moss Warranty Act, a dealer must prove the intake caused a failure to deny a warranty claim. In practice, intake installs rarely cause warranty issues on stock powertrains. If you're on a new or CPO car, document everything and use reversible installs.

Which intakes fit both 2015-2018 and 2019-2021 WRX models?

PERRIN (PSP-INT-325RD and PSP-INT-325NY), Injen SP1209WB, Cobb SF systems, and Mishimoto MMAI-STI-08W kits all cover the full 2015-2021 span. The aFe Takeda Stage-2 options (TA-4305B-1R and TA-4305B-1D) are rated 2015-2018 only. K&N 69-8011TTK is 2018-2019 specific.

Can a cold air intake cause hydrolocking on the FA20?

It's a legitimate concern on any true cold air intake positioned near the bumper or low in the engine bay — driving through standing water risks ingesting water before the turbo. The intakes in this guide are positioned within the engine bay rather than in the fender well, which minimizes that risk significantly versus low-mounted fender intakes. Still, avoid aggressive water crossings with any aftermarket intake installed.