Suspension and Components› Shocks, Struts, Coil-Overs and Components

QA1 Precision Products, Inc

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

$1,124.64

SKU: Q00B M421PR

In Stock
In Stock
Ships by Jun 17
Free Shipping
Non-Returnable Item
INSTALL DIFFICULTY
DIY PRO SHOP

Moderate — 2–4 hours

Description

The QA1 M421PR is an advanced, gas-charged shock designed for high-performance racing and pro-touring vehicles. It features independent compression and rebound valve adjustment with 24 clicks and low-speed bleed for precise tuning. QuickTune Technology allows for revalving without removing the shock, and its large solid piston improves driver feel and control, handling up to 1,600 lbs of force. The indexable base eyelet provides multiple mounting positions, and it comes in a black and red finish with included mounting hardware.

Fitment

Fitment Guaranteed

Don’t gamble
on fit.

Log your build in the MOTORMIA app and we’ll guarantee this part fits your exact setup — or your money back, return shipping covered.

Available on iOS & Android

Specifications

BrandQA1 Precision Products, Inc
Part NumberQ00B M421PR

Videos

QA1 Mod Shocks: Track Day Performance Tuning

QA1 Mod Shocks: Track Day Performance Tuning
How Mod Series Shocks Work and How to Adjust Them - Info Straight from QA1!

How Mod Series Shocks Work and How to Adjust Them - Info Straight from QA1!
Debunking the Coil-Over Myth: Smooth Rides & Maximum Performance!

Debunking the Coil-Over Myth: Smooth Rides & Maximum Performance!
How to Select Your Drag Shocks | QA1 Tech

How to Select Your Drag Shocks | QA1 Tech
THE Secret to the FASTEST 60ft's!!! QA1 Mod Shock

THE Secret to the FASTEST 60ft's!!! QA1 Mod Shock
Shock Travel 101 | QA1 Tech

Shock Travel 101 | QA1 Tech
Installation of the New QA1 Mod Series Coilover Shock

Installation of the New QA1 Mod Series Coilover Shock
QA1 Coilovers: What They Got Wrong & How We Made It Right

QA1 Coilovers: What They Got Wrong & How We Made It Right
The Impact of Shock Valving on Ride Quality and Handling

The Impact of Shock Valving on Ride Quality and Handling
MOD™ Series Shocks from QA1

MOD™ Series Shocks from QA1

Buy with Confidence

Built for enthusiasts. Every order is backed by our 30 day return window on eligible items. Unused and uninstalled products may be returned with approved RMA and no restocking fees when received in new condition. Orders placed through the MOTORMIA app with a complete build qualify for our Fitment Guarantee — free return shipping if the part doesn’t fit your exact setup. The guarantee covers fit only; installation must follow manufacturer instructions, and we recommend a qualified shop for parts marked Difficulty 4–5.

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