My Account
My Garage
Shopping Cart

Shopping Cart

0 items in your Cart
View Cart
Subtotal
Track
My Order
MY GARAGE Select Vehicle
MY GARAGE

QA1 DD303 Proma Star Double Adjustable Coilover Shock - 9.5-12.75

Part of: QA1 Precision Products Proma Star Double Adjustable Coilover Shock

Other options in this family: QA1 Precision Products DD511 QA1 Precision Products DD403 QA1 Precision Products DD404 QA1 Precision Products DD302 QA1 Precision Products DD301

Manufacturer

Picture for manufacturer QA1 Precision Products

Part Number

DD303
8 reviews
Sale Price

$334.95

In Stock (10)

delivery box

Usually delivered within 2 days

Check out with

ApplePay
Authorize Seller Badge
No Hassle Returns

No Hassle Returns

Live-in-stock inventory

Live-in-stock inventory

Fitment guaranteed

Fitment guaranteed

Product Details

The QA1 Proma Star DD303 is a premium double-adjustable coilover shock designed for serious performance applications. Featuring a machined aluminum body with bright anodized finish and a 5/8" chrome-plated solid piston rod, this shock delivers exceptional quality and reliability for street performance, autocross, drag racing, and road racing builds.

Advanced Adjustability:

The double-adjustable design provides 324 distinct valving combinations through independent compression and rebound adjustment knobs, allowing you to fine-tune your suspension to match your exact driving style and track conditions. This level of precision control makes the Proma Star ideal for competitive motorsports and performance enthusiasts who demand optimal handling.

Key Features:

  • 324 valving options with independent compression and rebound adjustment
  • Machined aluminum body with bright anodized finish for durability and corrosion resistance
  • 5/8" chrome-plated solid piston rod eliminates flex under load
  • Double-lip piston with wiper seals prevents seal drag and contamination
  • Deflective disc valving for increased sensitivity and response consistency
  • Accurate piston-to-cylinder wall seal improves valving consistency
  • Teflon/Kevlar race bearing mounting provides reduced friction and wear
  • Dyno tested and serialized for quality assurance
  • Revalvable and rebuildable by QA1 authorized service centers
  • Includes aluminum spring cap, spring seat with washer, and locking ring
  • Made in the USA

Specifications:

  • Compressed Height: 9.50 inches
  • Extended Height: 12.75 inches
  • Recommended Ride Height: 10.75 to 11.25 inches
  • Compatible Spring Length: 7 to 10 inches
  • Mounting Style: Eye-to-Eye with Bearing
  • Piston Rod Diameter: 5/8 inch

Each shock is sold individually. Perfect for custom street rods, pro-touring builds, and race applications where precise suspension control is critical for performance.

Products specifications

Adjustable Mounting Bracket Included

No

Adjustable Valving

Yes

Body Diameter (in)

2.000 in.

Bushing Color

Natural

Bushing Material

Steel

Coil-Over Shock Type

Double-adjustable

Coil-Over Springs Included

No

Collapsed Length (in)

9.500 in.

Compressed Height

9.5

Extended Height

12.625

Extended Length (in)

12.625 in.

Gas Charged

No

Internal Design

Twin-tube

Lower Mount

Bearing

Mounting

Bearing

Notes

Remote wireless ready, can be used with QA1 two or four channel wireless remote controller.

Number of Valving Selections

324

Quantity

Sold individually.

Recommended Ride Height

10 3/4 - 11 1/4

Recommended Spring Diameter (in)

2.500 in.

Recommended Spring Length (in)

7-9 in.

Shock Body Finish

Clear anodized

Shock Body Material

Aluminum

Spring Length

7 / 9

Upper Mount

Bearing

Title

QA1 Shock Absorber DD303

Prop 65

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

Fast Shipping. Good packaging. Very good pricing. Will shop from again.

straight forward order process, great price.

WHOA!!!! Best price around! I ordered on a Friday night and had the items the following Tuesday! You can't beat that with a wooden spoon!!! Autoplicity HAS been bookmarked for future orders. They are the Crutchfield of auto parts!

Great price and received item in a timely and in great condition. Will definitely shop here again!

After searching for the best prices for the product that I wanted, I ended up with Autoplicity. I quickly got a response that my product has just been shipped and I am very impressed that Autoplicity is giving me an incentive to write a review on them. This tells me that this company is very concerned with the satisfaction of their customers. I am currently waiting for the order to arrive, but so far, I am extremely confident and happy with Autoplicity!

Customer Care took care of my return and refunded the shipping after there was some order confusion. Thank you for taking care of everything!

Wow that was fast. I ordered a Pertronix Ignitor conversion kit. Not only were they by far the lowest price I could find, they shipped within hours of submitting the order. I got the shipment in less than 24 hrs, even though I ordered ground shipping. I was a little bummed that they did not offer free shipping, as I am used to with other online places, but with their fast turnaround, I am not begrudging it. Sure it might have been because they have a warehouse nearby, but it was still unexpectedly impressive. The part arrived and looks like it all there and should be good to go. <br><br>I can't vouch for their customer service, but so far I am pleasantly surprised.

My Superchips Cortex arrived within a few days of order and by far was the best price arround. Product arrived in perfect condition and worked as described. Great deal. Order #10984

Share icon
Return Policy
Returns are easy at THMotorsports

Not happy with a purchase? No problem. We've made returning items as easy as possible. And most purchases can be returned for free for 30 days. Learn more about our Returns Policy