TRQ Ignition Coil Set Compatible with 2017-2018 Subaru Forester - 4

In this review of the TRQ Ignition Coil Set, the bottom line is simple: this 4-piece coil kit is aimed at Subaru owners who need a dependable, direct-replacement repair that restores engine smoothness without modification. The reviewer found these coils best for DIY mechanics and independent shops replacing worn or failing coils on H4 2.0L and 2.5L Subaru engines. The biggest reason to buy is the direct-fit design and pre-assembled boots that save installation time while delivering solid value compared with OE-level modules.

Key Features

• Complete 4-piece kit: Includes four ignition coils so the installer can replace all cylinders at once and avoid uneven wear between old and new parts.
• Direct replacement fit: Engineered to match original equipment dimensions so no modifications are needed during installation.
• Durable construction: High dielectric epoxy and reinforced bobbins improve longevity under heat and vibration for extended service life.
• Protective boot materials: Rubber, silicone, or phenolic resin shell resists premature boot wear and helps maintain a reliable spark transfer.
• Wide model compatibility: Designed for multiple Subaru H4 applications including Forester, Outback, Legacy, and WRX for straightforward fitment checks.

Who It's For

The TRQ Ignition Coil Set is ideal for owners of 2015-21 WRX and 2015-19 Outback or Legacy and 2017-18 Forester models with H4 2.0L or 2.5L engines who want a straightforward, cost-effective replacement. It suits DIY enthusiasts comfortable with basic engine work and independent shops replacing coils as part of routine tune-ups or to address misfires and rough idle.

Those who should look elsewhere include owners seeking OEM-branded coils for warranty continuity or vehicles with diagnosed electrical issues beyond coils (such as wiring harness damage); in such cases a deeper electrical diagnosis or OEM parts may be preferable.

Pros & Cons

Pros

• Direct-fit design makes installation quick and eliminates modifications for most compatible Subaru H4 engines.
• Quality construction with reinforced bobbins and high dielectric epoxy for improved durability.
• Good value as a 4-piece set, allowing full-bank replacement to restore consistent performance.

Cons

• Some users report mixed outcomes on long-term reliability, so occasional coil failure has been noted in customer feedback.

Specifications

Kit Contents	4 ignition coils
Compatibility	2015-19 Outback, 2017-18 Forester, 2015-19 Legacy, 2015-21 WRX (H4 2.0L / 2.5L)
Reference Numbers	22433AA70A; 22433AA70B; 178-8570; UF767 (and others)
Coil Type	Direct replacement
Color	Black
Protective Shell	Rubber, silicone, or phenolic resin
Quantity	4 piece

Our Verdict

The TRQ ignition coil set is a practical, cost-conscious choice for Subaru owners who need a reliable direct-replacement to restore engine smoothness and acceleration. With solid materials, pre-assembled boots, and full-bank coverage, it represents good value for DIYers and independent shops, though those prioritizing OEM branding or concerned about isolated failure reports may prefer alternative options.

Frequently Asked Questions

Will these coils fit my 2017 Forester 2.5L?
Yes, the kit is listed as compatible with the 2017-18 Forester H4 2.5L; confirm fitment against the vehicle before purchase.

Are any modifications required to install these coils?
No, the coils are designed as direct replacements with pre-assembled components so no modifications should be necessary for supported models.

Does the kit include all four coils for a full replacement?
Yes, the package contains four ignition coils to replace all cylinders at once for consistent performance.