There are quite a few coilover options on the market for the Alfa Romeo 4C, but our absolute favorite is Intrax. Why?
 
Because unlike mass-produced off-the-shelf kits, every single Intrax shock absorber is custom-built to order. They start with raw materials and manufacture each kit specifically around your vehicle’s exact weight, power, tire setup, and intended use—whether that is spirited street driving, track days, or dedicated racing. Intrax makes no compromise on quality between street and competition setups, utilizing inverted upside-down MacPherson struts (available in oversized Ø45mm or Ø52mm XL cartridges) to drastically increase installation rigidity, eliminate flex, and sharpen front-to-rear steering response. Every shock also features an integrated internal thermostat to maintain consistent oil temperatures and stable damping performance regardless of heat build-up.
 
For the Alfa Romeo 4C (Type 960, 2013+), Intrax offers three primary performance tiers, each available in a standard chassis setup or a heavy-duty "XL" configuration:
Intrax 1K2 Lineup: Built for drivers who want top-tier performance without a complex setup process. The 1K2 features a unique single adjustment knob that controls both compression and rebound simultaneously in a perfectly balanced ratio. The rear features an inverted Ø45mm insert for superior structural stiffness. The 1K2 XL upgrades the rear chassis to a massive 62mm housing with a 52mm insert, paired with lightweight aluminum tubes and brackets to maximize rigidity and eliminate structural flex on aggressive track runs.
Intrax 2K2 Lineup: Designed for drivers who demand independent control over their chassis dynamics. Equipped with external reservoirs and increased oil volume, the 2K2 provides separate adjustments for bump (compression) and rebound. The 2K2 XL combines these dual-knob tuning capabilities with the ultra-stiff 52mm inverted rear architecture.
Intrax 4-Way Lineup: The flagship competition suspension. The 4-Way system offers completely independent adjustments for high-speed compression, low-speed compression, overall low-speed range, and rebound—all functioning with zero cross-over interference. The 4-Way XL represents the pinnacle of motorsport engineering, combining full 4-way adjustability with the 52mm rear XL architecture.
To further fine-tune your setup, Intrax offers several high-performance technical options:
Black Titan Coating: An ultra-hard, military-grade shaft coating that drastically reduces friction, lowers oil temperatures, prevents rust, and doubles service life.
ARC® Anti Roll Control: An ingenious internal mechanical valving system that prevents unwanted body roll and pitch during cornering or heavy braking, allowing you to run comfortable spring rates without suffering from excessive body lean or bottoming out over curbs.
Front Alignment Shim Kit: Specially engineered shims to add extra front caster and camber, eliminating factory steering vagueness and drastically improving front-end feedback.
 
We know that navigating suspension options can be overwhelming, but because every Intrax system is tailored specifically to your vehicle, we are here to walk you through selecting the ideal damper, spring rate, and feature set for your driving style. Feel free to reach out to us with any questions regarding setup, technical specs, or custom ordering!