ATI Damper 5.67in Aluminum 6 Groove 3% Underdrive 1Pc (20082015 Mitsubishi Evo X) ATI918253
High-Performance 3% Underdrive Super Damper for Mitsubishi Evo X
The ATI 5.67-inch Aluminum Super Damper (part ATI918253) is purpose-built for the 20082015 Mitsubishi Lancer Evolution X. Featuring a precision-machined 1-piece aluminum construction with a 6-groove pulley and 3% underdrive design, this damper is engineered to reduce rotational mass, enhance throttle response, and provide superior harmonic control. Whether you're daily driving or pushing serious boost on the track, the ATI Super Damper delivers unmatched performance and durability under the most demanding conditions.
Performance Highlights
- 3% underdrive ratio frees up horsepower by slightly slowing accessory drive speed
- Lightweight 1-piece aluminum body reduces rotating mass for faster revs
- 6-groove pulley configuration supports factory belt setups
- 5.67-inch outer diameter for compact fitment and balance stability
- SFI 18.1 certified and fully rebuildable for long-term use
Quick Specs
- Outer Diameter: 5.67 inches
- Material: Aluminum
- Pulley Type: 6 Groove
- Design: 1-Piece Super Damper
- Drive Ratio: 3% Underdrive
- Certification: SFI 18.1
- Application: 20082015 Mitsubishi Lancer Evolution X
- Part Number: ATI918253
Why Choose ATIs 3% Underdrive Damper for the Evo X?
Designed for high-performance turbocharged setups, the ATI918253 Super Damper delivers rock-solid crankshaft stability and measurable performance gains. The slight underdrive reduces parasitic loss while maintaining full accessory reliability. Built with precision balance and SFI 18.1 certification, its trusted by competitive tuners and racers to handle everything from daily spirited driving to full-on track abuse all while protecting your 4B11 engine from destructive harmonics.
Frequently Asked Questions
Is this damper a direct-fit for the Evo X?
Yes. The ATI918253 is a direct bolt-on replacement for 20082015 Mitsubishi Lancer Evolution X models and works with factory belt systems.
What does 3% underdrive mean?
The pulley diameter is slightly smaller than stock, reducing accessory drive speed by approximately 3%. This helps free up horsepower while maintaining safe alternator and power steering function.
Does it help with engine vibration?
Absolutely. The ATI Super Damper is engineered to absorb and control harmonic vibrations, preventing crankshaft damage and improving overall engine smoothness.
Is the damper rebuildable?
Yes. Like all ATI Super Dampers, this unit is fully rebuildable using genuine ATI replacement parts for long-term serviceability.
Vehicle Fitment
- 2008 Mitsubishi Lancer Evolution X 2.0L Turbo
- 2009 Mitsubishi Lancer Evolution X 2.0L Turbo
- 2010 Mitsubishi Lancer Evolution X 2.0L Turbo
- 2011 Mitsubishi Lancer Evolution X 2.0L Turbo
- 2012 Mitsubishi Lancer Evolution X 2.0L Turbo
- 2013 Mitsubishi Lancer Evolution X 2.0L Turbo
- 2014 Mitsubishi Lancer Evolution X 2.0L Turbo
- 2015 Mitsubishi Lancer Evolution X 2.0L Turbo
Contact Beefcake Racing
Beefcake Racing is your trusted source for ATI Super Dampers and performance parts for Mitsubishi Evolution X builds. For expert advice or to place an order, email sales@beefcakeracing.com or call 1-855-827-7223. Our team of enthusiasts can help you choose the perfect damper for your street or track setup.
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