Primitive - R180 Rear Differential Skid Plate

Motorsport-Grade Protection for Your R180 Drivetrain.

f you're running an STI or a rally-swapped Subaru, your drivetrain is built for abuse—but the cast-iron R180 differential housing is still vulnerable to catastrophic strikes. The Primitive Racing R180 Rear Differential Skid Plate is the gold standard for stage rally and performance builds.

Because the R180 is physically larger than the standard R160, it often sits lower in the chassis, making it a magnet for rocks and stumps. This heavy-duty 3/16" aluminum plate acts as a sacrificial shield, allowing you to slide over obstacles without risking a cracked housing or a snapped mounting stud.

Product Features

R180 Specific Geometry: Precision-formed specifically for the larger R180 housing found in STIs and motorsport-spec drivetrains.

3/16" 5052 Aluminum: Engineered from premium, laser-cut aluminum for the ultimate strength-to-weight ratio.

Countersunk Hardware: Features recessed mounting holes to protect the bolt heads from being sheared off or damaged during heavy impacts.

Wrap-Around Design: Not just a flat plate; the Uni design wraps around the bottom and lower sides of the differential to guard against lateral impacts.

No-Snag Performance: The tapered leading edge ensures that when you do make contact, you glide forward rather than getting "anchored" to a trail obstacle.

Direct Bolt-On: Installs quickly using existing mounting points. No drilling or permanent vehicle modification is required.

Technical Specifications

Material: 3/16" (5mm) 5052 Aluminum
Compatibility: R180 Differential Housing
Fitment: Fits with upgraded exhaust systems and vibration dampener
Hardware: Stainless Steel Countersunk Bolts Included
Finish: Polished Aluminum
Weight: 2.01 lbs
Hardware: Included (Zinc-Plated)
Installation: Direct Bolt-on
Manufacturer: Primitive Racing
Origin: Made in the USA

Performance Note for Rally & STI Owners

Rally Tested: The R180 is the differential of choice for Subaru rally cars globally. This skid plate is designed to handle the repetitive high-speed impacts common in American Rally Association (ARA) and grassroots rallycross events. If you've invested in an STI drivetrain, this is the most cost-effective insurance you can buy for your rear gear set.