Founded as ISIS Performance and rebranded to ISR Performance Parts in 2015, ISR specializes in high-value, sport-compact aftermarket components for brands like Hyundai, Subaru, Mazda, Nissan, Toyota, and Scion. With roots in extensive on-track and off-road testing, ISR’s in-house R&D ensures every product—from brakes, coilovers, and exhausts to intercoolers, couplers, and engine mounts—meets performance demands without breaking the bank.

Headquartered in Southern California, ISR blends affordability and quality through secure US shipping and a straightforward warranty structure. Their lineup includes Hyundai and Genesis-specific coilovers, Nissan Z exhausts, LS swap kits, and BRZ/FR-S turbo lines, all designed, tested, and sold directly. ISR’s mission is clear: to "fill a void in the sport‑compact industry" by offering well-engineered, price-conscious parts backed by real-world performance credibility. Whether you're on the track or building a daily hybrid sleeper, ISR Performance delivers dependable, tested upgrades with a no-nonsense approach.