ECS Tuning B6/7 S4 Performance Clutch & Lightweight Flywheel Kit

The naturally aspirated 4.2L V8 in your Audi B6/B7 S4 delivers classic V8 power and Quattro traction, but the factory drivetrain leaves serious performance on the table. Tipping the scales at a hefty 26.5 lbs, the stock dual-mass flywheel dulls engine response, slows rev-matching, and masks the true capability of your high-revving 8-cylinder engine. Pair that with a factory clutch prone to slipping under tuned torque levels, and your drivetrain quickly becomes the bottleneck.

The ECS Tuning Stage 2 Performance Organic Clutch & Lightweight Flywheel Kit is the ultimate direct-replacement drivetrain overhaul for enthusiastic street drivers and track weekenders alike. By combining our high-clamp Stage 2 organic clutch with our precision-engineered 18.9 lb. lightweight single-mass flywheel, this kit sheds 7.6 lbs (a massive 29% rotational mass reduction) right off the crankshaft.

The result? Instantaneous throttle response, lightning-fast revs on downshifts, faster acceleration out of corners, and the torque capacity to handle up to 445 lb-ft of torque.

Engineered for Street Civility
Performance upgrades shouldn't ruin your morning commute. Where many lightweight single-mass flywheels compromise daily drivability with aggressive noise, vibration, and harshness (NVH), our extensive testing confirms minimal to no increase in noise when installed. Coupled with a 240mm full-face high-performance organic disc, you get smooth, progressive modulation and chatter-free engagement with factory-like pedal effort.

Race-Grade Durability & Safety
Each flywheel is precision-machined from heat-treated 4140 chromoly steel and hardened to HRC 28–32 for extreme strength, stress relief, and thermal stability under heavy load. Non-friction surfaces feature a black zinc coating for long-term corrosion resistance, and every unit undergoes dynamic balancing exceeding OEM G16 specifications (to 175 g-mm) for vibration-free operation all the way to redline.

For maximum peace of mind, the flywheel is SFI 1.1 certified—having successfully passed rigorous independent laboratory testing spun at 1.5x engine redline for one full hour without failure. An integrated tone ring featuring an OEM-matched gear tooth profile ensures seamless, flawless interaction with factory engine electronics and crankshaft position sensors.

Key Benefits:

• 29% Rotational Mass Reduction: Drops flywheel weight from 26.5 lbs to just 18.9 lbs for dramatic improvements in engine rev speed and throttle response.
• 445 lb-ft Torque Holding Capacity: Upgraded pressure plate delivering 2,055 lbs of clamping force easily handles Stage 1 & 2 tuned 4.2L engines.
• 240mm Full-Face Organic Disc: Maximizes surface contact for predictable, chatter-free modulation and long friction life without aggressive flywheel wear.
• Minimal NVH Increase: Single-mass flywheel architecture engineered specifically to maintain daily street comfort and quiet operation.
• 4140 Chromoly Construction: Heat-treated to HRC 28–32 and black zinc coated for superior thermal stability and corrosion resistance.
• SFI 1.1 Certified & Dynamically Balanced: Tested to 1.5x redline and balanced past OEM G16 specs for absolute safety at elevated RPMs.
• Flawless OEM Electronics Integration: Integrated tone ring with exact OEM tooth profile works natively with factory engine management.

KIT CONTENTS

• ECS Lightweight Flywheel
• ​ECS Organic Stage 2 Clutch Kit
• Flywheel bolts (8)
• Pressure plate bolts (6)
• Exhaust Locking Nut (6)
• Clutch pilot bearing
• Throwout Bearing

• Clutch Alignment Tool

PRODUCT DEVELOPMENT

Our B6/7 S4 Performance Clutch & Lightweight Flywheel Kit was designed, engineered, tested, and quality inspected by our Research & Development team at our Wadsworth, Ohio, facility. We strive for the highest level of precision and quality through leading-edge product development technology, including FARO laser scanning for reverse engineering and quality inspection, SolidWorks 3D CAD modeling, rapid prototyping utilizing our in-house 3D printer, and rigorous long-term product testing.