Can I adjust the spring preload on these coilovers?

The AST 5100 series allows for ride height adjustment, which is separate from spring preload. The spring rates for the rear are fixed and determined by AST's development process for the RS5.

Do I need to buy new top mounts for installation?

No, these coilovers are designed to use your vehicle's original OEM top mounts. This helps simplify the installation process.

What is the benefit of a monotube damper design?

Monotube dampers use a larger piston to control damping adjustments, like rebound. They also prevent aeration and foaming, which means the valving stays responsive and consistent, especially under hard use.

Specifications

Brand: AST
Part #: ACU-A2109S
UPC: astACU-A2109S

AST 5100 Series Shock Absorbers Coil Over Audi A5 B8

Name: AST 5100 Series Shock Absorbers Coil Over Audi A5 B8
Brand: AST
SKU: ast-ast-5100-series-shock-absorbers-coil-over-audi-a5-b8-t14-341795
Price: 4482.56 USD
Availability: BackOrder

$4482.56

On Backorder

Order now to reserve yours — we'll ship as soon as stock arrives. Full refund if we're unable to fulfill.

Fits 2013-2015 Audi RS5. AST 5100 Series coilovers offer 1-way adjustable rebound and ride height for improved grip and handling.

Key Features

Direct fit — verified for 2013-2015 Audi RS5
Monotube dampers — offer a large piston for precise rebound control and consistent performance without foaming
1-way adjustable rebound — lets you fine-tune the shock's return to extension across 12 distinct positions
Adjustable ride height — allows you to set your vehicle's stance and center of gravity
Front coilover design — integrates spring and shock for a complete front suspension unit
Rear divorced setup — maintains separate spring and shock like the OEM configuration for a comfortable balance

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About this part

Product Details

AST makes this 5100 Series coilover suspension for the 2013-2015 Audi RS5. This kit is designed to give you better road balance for daily driving, controlling your car's height and grip through adjustable rebound damping.

The 5100 series uses a monotube damper design. This means a larger piston inside controls the rebound adjustment, which is how the shock returns after being compressed. Monotube dampers don't get foamy or aerated like twin-tube designs, so the valving stays responsive. The front dampers are coilover style, while the rear maintains a separate spring and shock setup, similar to the factory design. This setup is chosen for a more comfortable ride that still handles well. The kit includes springs with fixed rates for the rear, based on AST's development for the RS5. You can adjust the rebound damping through 12 positions to fine-tune how the suspension feels and reacts.