ATI Damper 6.78in Aluminum 6 Groove 10% UD 25T 8mm HTD Drive On Rear (19982002 Chevy Camaro & Pontiac Firebird / 20042006 Pontiac GTO) ATI918855
Precision-Balanced Super Damper with 10% Underdrive and 25T HTD Rear Drive
The ATI 6.78-inch Aluminum Super Damper (part ATI918855) is engineered for LS1-powered 19982002 Camaros and Firebirds and 20042006 Pontiac GTOs. It features a 6-groove front pulley with a 25-tooth, 8mm HTD drive on the rear, ideal for supercharger or accessory drive systems. With a 10% underdrive, this damper reduces accessory drag for more efficient power delivery while maintaining reliability. Precision-machined from high-strength aluminum, it delivers exceptional harmonic control, improved throttle response, and long-term durability. Like all ATI products, its SFI 18.1 certified and fully rebuildable for maximum service life.
Performance Highlights
- 6.78-inch outer diameter balances clearance and damping performance
- 10% underdrive reduces parasitic loss and frees up horsepower
- 25T 8mm HTD rear drive supports blower or accessory belt systems
- 6-groove serpentine pulley maintains OEM-style belt alignment
- Lightweight aluminum construction reduces rotating mass for faster revs
- SFI 18.1 certified for competition-level safety and reliability
- Fully rebuildable for long-term performance and serviceability
Quick Specs
- Outer Diameter: 6.78 inches
- Material: Aluminum
- Pulley Style: 6 Groove Front
- Rear Drive: 25T 8mm HTD
- Underdrive: 10% Reduction
- Certification: SFI 18.1
- Design: Rebuildable
- Part Number: ATI918855
Why Choose ATIs 10% Underdrive Super Damper?
The ATI918855 Super Damper offers a perfect balance between performance gains and accessory reliability. The 10% underdrive setup provides moderate parasitic drag reduction without affecting charging or cooling performancemaking it ideal for both daily-driven and high-performance LS builds. The 25T 8mm HTD rear drive gives you flexibility to power a supercharger or additional accessories while maintaining exceptional harmonic balance and crankshaft protection.
Frequently Asked Questions
Whats the advantage of a 10% underdrive setup?
It offers a safe reduction in accessory load, freeing up 36 horsepower while keeping all factory systems fully functional.
What is the 25T 8mm HTD rear drive used for?
The rear HTD drive allows mounting of a supercharger or other accessory belt system for boosted or custom applications.
Is this damper suitable for racing?
Yes. The ATI918855 is SFI 18.1 certified and built for both street and race performance reliability.
Can the damper be rebuilt?
Yes. Like all ATI Super Dampers, its fully rebuildable to ensure long-term consistency and performance.
Fitment
- 1998 Chevrolet Camaro
- 1999 Chevrolet Camaro
- 2000 Chevrolet Camaro
- 2001 Chevrolet Camaro
- 2002 Chevrolet Camaro
- 1998 Pontiac Firebird
- 1999 Pontiac Firebird
- 2000 Pontiac Firebird
- 2001 Pontiac Firebird
- 2002 Pontiac Firebird
- 2004 Pontiac GTO
- 2005 Pontiac GTO
- 2006 Pontiac GTO
Why Buy from Beefcake Racing?
Beefcake Racing is your go-to source for ATI Super Dampers and LS performance components. We provide expert support, competitive pricing, and fast shipping across the full ATI lineup. For personalized assistance, email sales@beefcakeracing.com or call 1-855-827-7223. Our knowledgeable team of enthusiasts is ready to help you choose the perfect damper for your build.
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