🔵 Buck Performance Custom Valved MK4 Supra / SC300 FRONT IRS Shocks

Twin Tube – Double Adjustable – Built for Real Power

Our new Custom Valved MK4 Supra / SC300 IRS Shocks are engineered specifically for high-horsepower Independent Rear Suspension drag applications. These are not off-the-shelf shocks — they are built around real-world data and developed with input from some of the fastest IRS cars in the country.

If you’re serious about putting power down, this is the shock package your MK4 needs.

✅ Available Valving Options (Select in Dropdown)

We offer four purpose-built valving packages:

• No Prep Valving

• Street / Strip Valving

• Radial Prep Valving

• Bias Ply Slick Valving

Each setup is tuned to properly control chassis separation, tire hit, and weight transfer depending on your surface and tire choice.

🔧 Shock Design & Capability

Twin Tube – Double Adjustable

• All-in-one twin tube shock design

• Independent Compression & Rebound Adjustments

• Broad adjustment range for fine tuning

• Designed for up to 1,500HP+ applications

• Rebuildable & Revalvable

• Built for durability and repeatable performance

These shocks are engineered to control high-horsepower IRS cars while maintaining consistency pass after pass.

🏁 Why Our Valving Works

Drag radial and high-power IRS setups require a very specific valving curve to:

• Control initial tire hit

• Manage chassis separation

• Prevent unloading

• Maintain traction down track

Our high-flow piston design and custom valving package deliver consistent performance and superior track application — whether you’re on no-prep or radial prep surfaces.

🔵 Front Spring Rate Options (Select in Dropdown)

Front spring rates are optional and vehicle-weight dependent.

We recommend:

• 400 lb

• 450 lb

• 500 lb

Recommended spring rate depends on front-end weight and power level.
If unsure, contact us with your setup and we’ll spec it correctly.

📊 Ideal For

• 1,000–1,500HP IRS MK4 Supras

• Drag Radial Applications

• No Prep Racing

• Bias Ply Slick Cars

• Street / Strip Builds

Whether you're running a small tire radial setup or full slick program, we have a valving package built around your racing environment.

🛠 Fitment

• 1993–1998 Toyota Supra (MK4) / SC300

• IRS Suspension Only

💪 Built to Last

We don’t cut corners. These shocks are built to handle serious power and repeated abuse. Fully serviceable and tunable, so as your program evolves — your suspension can evolve with it.

Standard Build time is 3-5 Days. If shocks are needed in a hurry please let us know and be aware of the rush fee.