AST Digressive Piston Upgrade – Suits 40mm & 46mm AST Dampers (Set of 4)

AST Digressive Piston Upgrade – Suits 40mm & 46mm AST Dampers

Application: Suits AST 40mm and 46mm damper bodies | Does 4 shocks

Part Numbers:

• 35PI-L7-A1-012 — 40mm Digressive Piston
• 35PI-L7-D9-012 — 46mm Digressive Piston

Upgrade your AST dampers with a digressive piston profile for improved handling response and greater low-speed damping sensitivity. The digressive piston design provides a softer initial response at low shaft velocities while building resistance more aggressively at higher velocities — ideal for track use where precise body control and driver feedback are critical.

Each kit services a full set of 4 shocks, making it a complete solution for your AST-equipped vehicle. Compatible with AST 40mm and 46mm damper bodies across the 5100, 5200, and 5300 series platforms.

Why AST?

• ✅ Engineered and manufactured in the Netherlands to exacting motorsport tolerances
• ✅ Monotube damper architecture for superior heat dissipation and consistent performance
• ✅ CNC-machined aluminium components for precision fitment and reduced unsprung weight
• ✅ Fully rebuildable and serviceable — upgrade pistons, valving, and internals as your build evolves
• ✅ Trusted by race teams and high-power builds worldwide across circuit, rally, and time attack disciplines

If you're unsure whether this will fit your vehicle, contact our team of experts via email at hello@iilumolab.com and send through a few photos of the car for us to verify fitment.

Installation

We always recommend professional fitment for guaranteed satisfaction. If you're wanting a hassle-free installation, feel free to contact our friendly team as we offer installation services in-store at our Melbourne workshop. For more details, contact us here.

Note

Professional installation and a comprehensive wheel alignment are highly recommended after fitting to ensure optimal tyre wear and handling performance.

Upon receiving the item, please ensure that the part is indeed the correct item you have ordered. This can be achieved by checking labels on the packaging. Please also ensure a proper test fit of the item is conducted prior to paint and/or installation. Returns/Warranty claims will be voided if the item has been tampered with, or is no longer in resalable/new condition.