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SKU: M911PR | UPC: 806990154217
QA1 MOD Series Piggyback Coil-Over Shock Absorber - Right Hand Bearing Mount
The QA1 M911PR MOD Series Piggyback Coil-Over Shock Absorber is the ultimate tunable performance shock for custom and high-performance vehicle builds requiring precise damping control, adjustability, and superior heat management. Featuring 4-way adjustable high/low-speed compression and rebound with QuickTune modular valve packs, this double-adjustable shock allows fully independent tuning of compression and rebound characteristics – delivering an expansive force curve and unmatched tunability. With a piggyback nitrogen-charged canister, sealed pivot bushings, indexable base eyelet, and 100% dyno-tested construction, the MOD Series is ideal for street, drag, road racing, or off-road applications demanding maximum performance and reliability.
Key Features
- 4-Way Adjustable Damping: Independent high/low-speed compression and rebound adjustment for precise tuning
- QuickTune Technology: Dry modular valve packs swap easily without opening the shock or risking contamination
- Piggyback Reservoir: Nitrogen-charged for increased oil capacity, superior heat dissipation, and consistent performance
- Double-Adjustable Design: Wide range of low-speed bleed adjustment for fine-tuned control over compression and rebound
- Indexable Base Eyelet: Reattach at desired angle for optimal shock and reservoir placement
- 100% Dyno Tested & Serialized: Proudly made in QA1's Lakeville, MN facility – every shock verified for performance
Specifications
| Specification | Detail |
|---|---|
| Part Number | M911PR |
| Configuration | Piggyback Reservoir – Right Hand |
| Mount Type | Bearing Mount |
| Collapsed Length | 14.875 inches |
| Extended Length | 23.625 inches |
| Internal Design | Dual Tube |
| Adjustability | 4-Way (High/Low-Speed Compression & Rebound) |
| Finish | Black |
| Material | Aluminum Cylinder |
| Coil-Over | Yes (Coil Spring Not Included) |
| Country of Origin | United States |
| Warranty | Limited Lifetime (QA1) |
Product Notes
- Right-hand piggyback configuration – ideal for custom coil-over setups with adjustable valving
- Valve packs can be swapped quickly for tuning – supports soft/firm compression and rebound options
- Designed for applications requiring 14.875" collapsed / 23.625" extended length – verify fitment
Installation Notes
- Estimated time: 2-4 hours per shock, advanced difficulty, professional installation recommended
- Requires coil-over setup, proper valving selection, and precise mounting – torque to spec
- Full alignment and suspension tuning advised after installation
This Part Fits
| Application | Notes |
|---|---|
| Custom Coil-Over Builds | Performance Vehicles Requiring Adjustable Piggyback Shocks (14.875"/23.625") |
| Common | Street, Drag, Road Racing, Off-Road Applications |
Why Choose QA1 MOD Series Piggyback Shocks?
- 4-way adjustability and QuickTune valve packs offer unmatched tunability and performance
- Piggyback reservoir ensures consistent damping under extreme heat and load
- Made in USA with dyno-tested, serialized quality – trusted in racing and high-performance builds
Frequently Asked Questions
-
Q: Can I adjust the valving on this shock?
A: Yes, 4-way adjustable high/low-speed compression and rebound; modular valve packs allow easy swaps. -
Q: Does it include a coil spring?
A: No, coil-over shock body only; pair with compatible QA1 springs for your setup. -
Q: Is professional installation required?
A: Recommended requires precise valving, mounting, and suspension tuning. -
Q: What applications is this shock suited for?
A: Custom coil-over builds needing adjustable damping, heat management, and 14.875"/23.625" length.
Shipping & Handling
- Method: UPS/FedEx Ground (Oversize)
- Availability: In stock - ships same or next business day
- Packaging: Secure protective packaging
- Weight: Approx. 9.5 lbs
QA1
Shop All QA1 Coilovers, Shocks, Springs, Handling Kits & Suspension Components Browse premium QA1 suspension parts and performance components at Black Ops Auto Works, including coilover kits, shock absorbers, lowering kits, handling kits, suspension conversion systems, four-link systems, springs, struts, rod ends, linkage rods, tube adapters, and suspension hardware for muscle cars, trucks, street builds, drag cars, and pro-touring applications. QA1 is one of the most recognized names in the suspension category, known for engineering products that improve ride quality, adjustability, handling, weight transfer, and overall vehicle control. Why Choose QA1 Suspension Products QA1 products are built for enthusiasts looking to improve suspension performance on classic, street, strip, and performance truck platforms. Popular reasons customers choose QA1 include: Adjustable suspension tuning for street and track use Improved handling, ride control, and weight transfer Vehicle-specific...
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