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QA1 Kit, Pro-Rear C-O S-Adj. 3.25" Proma Star 12-175/350
$765.95

QA1 Pro-Rear System DS501-175V1

Elevate your vehicle's performance with the QA1 Pro-Rear System DS501-175V1. This advanced suspension kit is designed to enhance your ride quality and handling, making it an ideal choice for drag racing, street performance, and street rod applications.

Key Features

  • Adjustable Options: Choose from double adjustable, single adjustable, or ride-sensitive non-adjustable options to suit your specific needs.
  • Smooth Adjustments: Enjoy evenly spaced valving changes throughout the adjustment range, ensuring smooth transitions without any jumps between clicks.
  • Lightweight Construction: Crafted from lightweight aluminum, these coil-over shocks provide durability without adding unnecessary weight to your vehicle.
  • Ride Height Adjustability: Customize your ride height to achieve the perfect stance and performance balance.
  • Revalveable & Rebuildable: The shocks can be easily revalveable and rebuildable by QA1 factory or authorized service centers, ensuring longevity and performance consistency.
  • 100% Dyno Tested: Each unit is rigorously dyno tested and serialized, guaranteeing top-notch quality and reliability.

Specifications

  • Model: DS501-175V1
  • Spring Rate: 175/350
  • Included Components: (2) Proma Star Shocks or Aluma Matic Shocks, (2) Linear or Variable Rate Springs, and all necessary mounting hardware.

Fitment

The QA1 Pro-Rear System is designed to fit a variety of applications, making it a versatile choice for automotive enthusiasts looking to enhance their vehicle's suspension system.

Customer Insights

Users appreciate the smooth adjustment capabilities and the significant improvement in handling and stability. Many have noted how easy it is to install, thanks to the comprehensive mounting hardware included in the kit. The ability to customize ride height and adjust valving on-the-fly has been a game changer for those who frequently switch between street and track settings.

Other Part Numbers:
QA1 #qapDS501-175V1

Proposition 65

WARNING: Cancer and Reproductive Harm
https://www.P65Warnings.ca.gov

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Who is QA1?

QA1 is a company that was founded in 1993. They specialize in manufacturing high-quality suspension parts, shock absorbers, composite driveshafts, bearings, steering components, and other related accessories. Their products are used in different industries such as the industrial, motorsports, and automotive sectors. Today, they are the leading manufacturer of OE parts in the market.

Suspension Experts

The company is best known for its motion control sub-assemblies and wide range of suspension systems. They are always searching for new ways to develop each component to enhance their products further. 

State-of-the-Art Facility

The company is housed in one of the most sophisticated facilities in the market to accommodate the increasing demands of its customers. With 100,000 square feet at their disposal, their facility contains high-tech equipment such as a CNC machine, laser cutting equipment, hydraulic presses, and filament windings. It allows them to manufacture the best product in the market.

QA1 is also one of the few companies that are ISO certified. It guarantees that their parts are manufactured consistently, following the standards put in place by the company and the regulators.

Purchase QA1 Products At Vivid Racing

If you are in the market for quality suspension parts for your vehicle, then QA1 is the brand for you. They have been manufacturing components for the last 28 years and have consistently given their customers parts that meet their demand. To know more about QA1, visit Vivid Racing and check out their list of parts that meet your demand.



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Things
Sale price None
Wholesale price $765.99
Shipping Weight: 37.00
Length: 40
Width: 8
Height: 8
Product Added At Monday 23 December, 2024
Product Modified At Friday 11 July, 2025
Imported By ETLOverride
Last Edited By Turn_API
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Emissions Info
Carb Approved -
Carb Number -
Epa Status N/A
Prop65 Yes
Carb Required -
Vendors
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Vendor Inv Cost Retail Jobber MAP Core Updated
Turn 14 $649.14 $848.55 ? $765.95 ? 2025-07-11 10:45:06

Manufacturer Direct Shipping
This item is available for direct shipping from the manufacturer. Please verify stock availability with the manufacturer. Once confirmed, you can place an order through [Meyer Distributing], who will arrange for dropshipping from the manufacturer directly to our customer.

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