What is the benefit of a progressive spring rate?

A progressive spring rate means the spring's stiffness changes depending on how much it's compressed. During normal driving, it's softer for a comfortable ride. When you corner hard or encounter bumps, it gets stiffer to control body roll and maintain stability.

Will these springs affect my ride comfort?

H&R Sport Springs are designed with a progressive spring rate that aims to maintain a superb ride quality for daily driving while still improving handling when you need it.

Do these springs come with everything needed for installation?

This kit includes the H&R Sport Springs. It is recommended to consult the manufacturer's installation guide or a professional mechanic to determine if any additional hardware or alignment services are needed for proper installation.

Specifications

Brand: H&R
Part #: 51659
UPC: 51659

H&R 99-04 Ford Mustang Cobra V8 Sport Spring (w/IRS)

Name: H&R 99-04 Ford Mustang Cobra V8 Sport Spring (w/IRS)
Brand: H&R
SKU: h-r-h-r-99-04-ford-mustang-cobra-v8-sport-spring-w-irs-t14-248179
Price: 365.64 USD
Availability: BackOrder

$365.64

On Backorder — Expected to ship by May 23, 2026

Order now to reserve yours — we'll ship as soon as stock arrives. Full refund if we're unable to fulfill.

Fits 1999-2004 Ford Mustang Cobra V8. H&R Sport Springs lower your car for better handling and a cleaner look.

Key Features

Fits 1999, 2001, 2003-2004 Ford Mustang Cobra V8 with IRS.
Constructed from strong and resilient 54SiCr6 spring steel that is shot peened.
Progressive spring rate design offers a balance of ride comfort and improved handling.
Lowers the vehicle's center of gravity, reducing body roll and enhancing cornering.
Helps reduce wind resistance for potentially improved gas mileage.
H&R's best-selling spring kit.

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Will it fit your car?

Fits these vehicles

Ford Mustang 1999, 2001, 2003-2004

About this part

Product Details

If you're looking to give your 1999-2004 Ford Mustang Cobra V8 a more aggressive stance and improved handling, H&R Sport Springs are a popular choice. These springs are designed to lower your vehicle's center of gravity, which helps reduce body roll during cornering, making it feel more planted on the road. You'll notice a tighter connection to the pavement, especially when you're pushing the car a bit.

H&R makes these springs from 54SiCr6 spring steel, a strong and resilient material that's shot peened for added durability. They use a progressive spring rate design, which means they offer a comfortable ride during normal driving but stiffen up when you need them to during spirited driving. This design helps maintain superb ride quality while still improving handling. Plus, lowering the car can also slightly reduce wind resistance, potentially offering a small improvement in gas mileage.

These are H&R's best-selling springs, and for good reason. They're a straightforward way to enhance your Mustang's appearance and driving dynamics. They are 100% made in Germany.