What is the main benefit of the monotube design in these coilovers?

The monotube design uses a larger piston to control rebound damping. This design prevents aeration and foaming, resulting in more responsive valving and consistent performance.

Can I adjust the spring rates on these coilovers?

Yes, you have the flexibility to adjust spring rates on these dampers. The initial setup is based on AST's extensive development, but individual preferences can be fine-tuned.

What is included with this set of coilovers?

This set includes front and rear dampers utilizing a coilover design, springs, and top mounts. It also includes camber-adjustable front top mounts and solid rear top mounts where applicable.

AST 02-08 BMW Z4 Coupe/Convertible - E85/E86 5100 Comp Series Coilovers

Specifications

Brand: AST
Part #: ACC-B1106SD
UPC: astACC-B1106SD

AST 02-08 BMW Z4 Coupe/Convertible - E85/E86 5100 Comp Series Coilovers

Name: AST 02-08 BMW Z4 Coupe/Convertible - E85/E86 5100 Comp Series Coilovers
Brand: AST
Price: 5559.68 USD
Availability: InStock

$5559.68

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

AST 5100 Comp Series coilovers for 02-08 BMW Z4 E85/E86. Offers 1-way adjustable rebound and ride height for track or street.

Key Features

12-position rebound adjustment — fine-tune damper return for specific driving needs.
Monotube damper design — provides consistent damping control without aeration or foaming.
Adjustable ride height — allows you to set your vehicle's stance.
Front and rear coilover design — offers greater adjustability and performance.
Camber-adjustable front top mounts — enable more precise wheel alignment for improved grip.
Includes springs and top mounts — ready for installation.

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Will this fit your vehicle?

Product Details

12 distinct rebound adjustment positions are available on these AST 5100 Comp Series coilovers for the 2002-2008 BMW Z4 Coupe and Convertible (E85/E86). These are built for drivers who want track performance but also need a balanced setup for daily driving. The monotube design helps manage damping for consistent handling.

The front and rear dampers use a coilover design, giving you more control over ride height and damping settings. You can also adjust the camber on the front top mounts to fine-tune front-end grip. The springs and top mounts are included, front and rear. These dampers are rebuildable at a certified AST service center.