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Qa1

QA1 MOD Series Coil-Over Shock Absorber - Remote - Right Hand - Bearing Mount - 10.625in/15in

SKU: QAPM421CR

Coilover Shocks and Struts

QAP Coil Shocks - MOD Series...

Qa1

QA1 MOD Series Coil-Over Shock Absorber - Remote - Right Hand - Bearing Mount - 10.625in/15in

SKU: QAPM421CR

Coilover Shocks and Struts

QAP Coil Shocks - MOD Series...

A$2,042.85
Limited Availability from MFR Limited stock available from the manufacturer's distribution centre. The dispatch timeframe shown is an estimate based on historical orders of this part. This item is not held in our own warehouse, and availability and release timing may vary depending on manufacturer stock movements and processing at the time of ordering.

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Description

QA1 MOD Series Coil-Over Shock Absorber - Remote - Right Hand - Bearing Mount - 10.625in/15in

Additional Information

MOD Series double adjustable with low speed bleed custom mount coil-over shock, right-hand remote canister. Compressed height of 10.63", extended height of 15". Bushing top and bushing bottom.

Part Type

Coilover

Product Overview

soft or firm compression and rebound valve packs also available. Once the desired valving is in place, the unique double adjustable design, with adjustable low-speed bleed, allows for fully independent control over the compression and rebound characteristics. With all these adjustability options, the MOD Series shock achieves an expansive force curve capability and an unprecedented level of tunability. The shock also features mounting adjustability to accommodate a variety of vehicles and mounting configurations. The nitrogen-charged canister is available in a piggyback or remote configuration for ease of installation in tight areas, and the base eyelet is indexable, so you can unbolt it and reattach it at the angle you need for the best shock and canister placement. Like all QA1 shocks, the MOD Series shock is 100% dyno tested and serialized and proudly made in QA1's Lakeville, Minnesota facility.

Data: v4.2 - Upd: 2026-11-08 22:58:31

Features

  • 100% dyno tested and serialized
  • 4-way adjustable high and low speed bleed
  • Made in the USA
  • QuickTune Technology: dry modular valve packs that can easily be swapped out
  • Remote or piggyback canister mounting options
  • Valve packs shock can quickly and easily be revalved without interrupting the oil path or opening the shock up for debris and air contamination

Images are supplied by the manufacturer and may be generic. While all efforts are made to provide accurate pictures, there may be differences in the actual product, such as colour, quantity, version, or included components. Please carefully review the description and specifications for details on inclusions or any variations. Some items may be sold individually or in sets, and images may occasionally depict additional products or quantities not included in your purchase. For assistance or clarification, please contact customer support.

Specifications

Product Details

Brand:QA1
Description:QA1 MOD Series Coil-Over Shock Absorber - Remote - Right Hand - Bearing Mount - 10.625in/15in
Manufacturer Part Number:M421CR
Part Number:qapM421CR
Title:QA1 Shock Absorber M421CR
UPC:806990153968

Product Downloads

# Document Type Download
1. Installation Instructions

Installation guides, warranty details, and other supporting documents are provided by the supplier. In some cases, these files may originate from regions outside your locale, meaning instructions, warranty procedures, and images may not fully align with your specific vehicle or region (e.g., LHD vs. RHD differences, return policies, etc.). If you need clarification, please contact a StreetFX support agent.

Data: v2 - Desc: v4.2 - Upd: 2026-11-08 13:42:56

Reference Information

Reference Data (Provide these details to our support team)
Brand Name/s Qa1
StreetFX SKU qapM421CR
SFX Item ID 4094449
Accounting SKU qap-M421CR
Manufacturer SKU M421CR
Manufacturer UPC 806990153968
Alternative References M421CR, QA1-M421CR

Coilover Shock, MOD Series, Double-Adjustable, Aluminum Body, Black Anodized, Twin-Tube, 15 in. Extended, 10.630 in. Collapsed, Each

QA1 MOD Series coilover shocks put the ability to re-valve your shocks—on your car—into the palm of your hand.

These innovative shocks feature QuickTune Technology, an industry-first that provides the ability to adapt to any track, any conditions, any time. The technology consists of interchangeable, dry modular valve pack assemblies, that can be thought of as dozens of finely tuned shocks you can hold in the palm of your hand. They define the valving curve of the shocks and can be changed without interrupting the oil pathways.

Simply unscrew from the shock, bolt-in another one with a new pre-determined valving range—and you're ready to go. There's no mess, no contamination, no air intrusion, and no downtime waiting on someone to re-valve your shocks. Ideal for Circle Track and Street/Strip applications, the shocks are available in a variety of extended and collapsed length models to best fit your vehicle.

Additional benefits and features of QA1 MOD Series shocks:
• Design delivers force, control, and unmatched tenability
• Hard anodized aluminum bodies with PTFE—durable, non-galling surface
• Double-adjustable shocks with low-speed bleed adjustments
• Large solid piston (with blow-off valve)—improved driver feel and control with up to 1,600 lb. force
• High-speed valving adjustment (coarse adjustment)—relates to shock operation during impact events, like hitting a pothole or curb
• 24 clicks/settings—wider range of adjustment than comparable shocks
• Indexable base eyelet—multiple mounting position to optimize knob access and provide more mounting flexibility
• Low-speed valving (fine-tune adjustments)—adjusts ride quality and weight transfer on corner entry/exit; more bleed for softer feel and less bleed for stiffer feel
• Piggyback or remote canister options
• Unique spring adjuster nut and tool
• Thrust bearings included
• Superior thermal performance, as oil is in constant contact with outer body
• One base shock can be upgraded over time to keep up with increased performance levels of your vehicle

Product Attributes
BrandQA1
Manufacturer's Part NumberM421CR
Part TypeCoilover Shocks and Struts
Product LineQA1 MOD Series Coilover Shocks
UPC806990153968
Coilover Shock TypeDouble-adjustable
Shock Body MaterialAluminum
Shock Body FinishBlack
Adjustable ValvingYes
Number of Valving Selections576
Extended Length (in.)15.00
Collapsed Length (in.)10.63
Upper MountEyelet
Lower MountEyelet
Internal DesignTwin-tube
Gas ChargedYes
Bushing MaterialSpherical bearing
Bushing ColorNatural
Coilover Springs IncludedNo
Adjustable Mounting Bracket IncludedNo
Hardware IncludedYes
QuantitySold individually.
NotesRemote canister attached to the shock with a 18 in. stainless braided hose.

Manufacturer Attributes
Title QA1 Shock Absorber M421CR
Brand QA1
Manufacturer Part Number M421CR
UPC 806990153968
Manufacturer Designation Shock, MOD C-O, RH Canister 10.63" Comp, 15.00"Ext, 4.38" Travel, Eye-B/Eye-B
Product Class Suspension Shock Absorber
Construction/Type MOD Series double adjustable with low speed bleed custom mount coil-over shock, right-hand remote canister. Compressed height of 10.63", extended height of 15". Bushing top and bushing bottom.
Product Outline 4-way adjustable high and low speed bleed
QuickTune Technology: dry modular valve packs that can easily be swapped out
Valve packs shock can quickly and easily be revalved without interrupting the oil path or opening the shock up for debris and air contamination
Remote or piggyback canister mounting options
100% dyno tested and serialized
Made in the USA
Vehicle Brief QA1 MOD Series Shock
Market Description Don't be limited to adjustments! Completely re-valve in minutes with the MOD Series shock. Designed specifically to meet the demands required by today's high performance drag race and handling/pro-touring cars, QA1's multi-patent-pending MOD Series shock will transform the way racers respond to changing track conditions and configurations. The key element to this tunability is QuickTune Technology: dry modular valve packs that can easily be swapped out, all while the shock remains on the car. An industry first, the MOD Series shock can quickly and easily be revalved without interrupting the oil path or opening the shock up for debris and air contamination. Medium compression and rebound valve packs come standard
soft or firm compression and rebound valve packs also available. Once the desired valving is in place, the unique double adjustable design, with adjustable low-speed bleed, allows for fully independent control over the compression and rebound characteristics. With all these adjustability options, the MOD Series shock achieves an expansive force curve capability and an unprecedented level of tunability. The shock also features mounting adjustability to accommodate a variety of vehicles and mounting configurations. The nitrogen-charged canister is available in a piggyback or remote configuration for ease of installation in tight areas, and the base eyelet is indexable, so you can unbolt it and reattach it at the angle you need for the best shock and canister placement. Like all QA1 shocks, the MOD Series shock is 100% dyno tested and serialized and proudly made in QA1's Lakeville, Minnesota facility.

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