Flatout Suspension Porsche 991 C4 [CS PRO] CSP-991C4

DISCLAIMER: This is a made to order item. The lead time for this product is 4-8 weeks.

Flatout CS PRO Coilovers for Porsche 991 C4

The Flatout CS PRO Coilovers are engineered for Porsche 991 C4 owners who demand precision handling on both street and track. With a 0.5–1.5” adjustable drop, these coilovers provide improved stance, sharper cornering, and refined ride quality while maintaining daily drivability.

Featuring external oil reservoirs and 3-way damping control (high/low speed compression & rebound), the CS PRO system offers professional-grade tuning flexibility. Combined with Eibach linear rate springs and Bilstein COB digressive pistons, these coilovers deliver unmatched stability, responsiveness, and endurance for spirited driving or track sessions.

Key Features

• Height Adjustable (0.5–1.5” Lower than OEM) → Fine-tune stance and handling for street or track use.

• Front & Rear Assemblies with External Reservoirs → Enhanced cooling and consistent damping under extreme conditions.

• 3-Way Damping Control → Adjust high & low speed compression and rebound for personalized ride and performance.

• Bilstein COB Digressive Pistons → Optimized handling with predictable response and control.

• Eibach Linear Rate Springs → Balanced performance with reduced NVH.

• Radial Bearings on Front Assembly → Precision steering and cornering stability.

• Electro-Plated Nickel Shock Cartridges → Long-lasting corrosion resistance.

• NC Machined High-Flow Aluminum Piston & Stainless Steel Shims → High-quality construction for durability.

• Dual Height Adjustable & 20-Point Rebound → Fine-tune ride height and damping for your build.

• Camber/Pillowball Upper Mounts → Track-ready handling and alignment precision.

• Brackets for Sensor Lines → Maintain OEM compatibility.

• 3-Year Warranty & Individual Parts Available → Confidence and long-term serviceability.

Why Choose Flatout CS PRO?

• Street & Track Ready → Ideal for daily driving and high-performance track sessions.

• Precision Handling → 3-way adjustable damping and linear springs provide sharp, predictable control.

• Durable & Rebuildable → Designed for long-term use with serviceable components and corrosion-resistant finishes.

• Customizable Performance → Fine-tune height, damping, and rebound to match your driving style and setup.

• USA Assembled → High-quality craftsmanship and attention to detail.

Flatout CS PRO Coilovers bring professional-grade performance to your Porsche 991 C4, combining adjustable stance, precise damping, and durable construction for a perfect balance of street comfort and track-ready handling.