ACT XACT Streetlite Clutch Flywheel for Audi S4 4.2L

Upgrading the heavy factory flywheel on your 2004-2009 Audi S4 4.2L V8 improves engine response and acceleration. The ACT 600950 XACT Streetlite Flywheel is considerably lighter than stock, delivering quicker revs and lower rotating inertia while remaining highly durable. It features a single-piece chromoly steel construction that eliminates the risk of warped inserts or loose ring gears while transferring heat efficiently.

Vehicle Fitment for ACT 600950

The ACT 600950 XACT Streetlite Flywheel is engineered specifically for 2004-2009 Audi S4 applications, including the Avant and Cabriolet models equipped with the 4.2L V8 engine. See the Vehicle Fitment table for full year-by-year fitment. For any fitment or compatibility questions, please email Sales@xlr8.com, our team is happy to help confirm fit for your specific vehicle.

Performance Highlights

• Weight: 15.2 lbs
• Material: Forged Chromoly Steel
• SFI Certification: SFI Spec 1.1
• Tooth Quantity: 117

Key Features and Benefits

• One-piece forged construction prevents warped inserts or loose ring gears
• Induction-hardened ring gears for maximum gear life
• Dynamically computer balanced for smooth high RPM reliability
• Serviceable design allowing the friction surface to be resurfaced
• Includes required replacement flywheel mounting bolts (M10-1.0 x 22mm)
• Backed by a one-year industry warranty

Specifications

• Product Weight: 15.2 lbs
• Material: Chromoly Steel
• Type: Streetlite
• Tooth Quantity: 117
• Mounting Hole Quantity: 8
• Friction Surface Diameter: 9.4 in
• Engine Balance: Internal
• SFI Rating: 1.1
• Replaceable Friction Surface: No

What's in the Box

• XACT Streetlite Flywheel
• Flywheel Bolts (M10-1.0 x 22mm)

Installation

Professional installation is highly recommended because accessing the flywheel requires transmission removal. Ensure all fasteners are torqued to specification during install. You can download the instructions here: ACT General Installation Instructions (PDF)