KellTrac XTR Spec Viking Berserker Coilover Kit, Pair (KTI-J425-XTR) - 2015–2026 Ford Mustang
If you’re pushing serious power and demanding absolute control from your suspension, the KellTrac XTR Spec Viking Berserker Coilover Kit is built for your Mustang. Designed for high-horsepower S550 and S650 IRS applications, this race-proven system delivers aggressive weight transfer, superior traction, and repeatable launches in the most demanding street, strip, prep, and no-prep environments.
Based on the ultra-capable Viking Berserker dampers, this XTR-COMP coilover kit is fully spec’d by KellTrac with application-specific spring rates, shock shaft travel, and custom compression and rebound valving. KellTrac’s suspension tuning has helped more 2005+ Mustangs achieve 1.19-second or quicker sixty-foot times than any other company—making this kit a go-to choice for racers chasing faster ETs and harder launches.
Each kit arrives fully assembled and ready for installation, eliminating guesswork and ensuring proper setup from the start. With premium hardware upgrades included and limited remote support available, this system is engineered to deliver maximum performance while maintaining adjustability and durability for real-world racing conditions.
Features
- Viking Berserker-based XTR-COMP coilover system, assembled and ready to install
- KellTrac-spec spring rates, shock travel, and valving for IRS Mustangs
- Designed for high-power street, strip, prep, and no-prep racing applications
- Proven suspension tuning used on 1.19-second and quicker sixty-foot Mustangs
- Advanced compression and rebound adjustability for precise chassis control
- Includes thrust bearing and spanner wrench upgrade options standard
- Improves weight transfer, traction, and launch consistency
- Limited remote setup and support included with all KellTrac spec coilovers
Fitment
- 2015 Ford Mustang
- 2016 Ford Mustang
- 2017 Ford Mustang
- 2018 Ford Mustang
- 2019 Ford Mustang
- 2020 Ford Mustang
- 2021 Ford Mustang
- 2022 Ford Mustang
- 2023 Ford Mustang
- 2024 Ford Mustang
- 2025 Ford Mustang
- 2026 Ford Mustang
Kelltrac Terms Of Service
Kelly considers his Kelltrac line to be a specialty line for a unique customer base and has his own terms of service in addition to Beefcake Racing's. You must accept these terms on all Kelltrac orders. Please read shipping times, cancellation, and returns. If time is of the essence, we do have other options that can ship right away / quicker. Just reach out to one of our sales associates at Beefcake Racing.
Cancellations & Returns
KellTrac Innovations does not accept product returns. Once your order ships, you own it and we will not accept it back - NO EXCEPTIONS. We do not accept order cancellations after the product has shipped. If you understand and accept this please check the box and continue checking out. If you do not accept this, please stop and discontinue the order process. Thanks!
Due to the custom nature of our business and product offerings, we charge a 20% order cancellation fee, period, non-negotiable, no matter who you are. Orders can only be cancelled before the product ships. We do not accept order cancellations after the product has shipped. If you understand and accept this please check the box and continue checking out. If you do not accept this, please stop and discontinue the order process. Thanks!
Leadtime
Please be aware that most orders ship within 2-4 weeks. In some (rare) cases, orders can take up to 6-8 weeks to ship. Holidays can severely impact these lead times. *DO NOT CONTACT US ABOUT YOUR ORDER UNLESS IT IS OLDER THAN 20 BUSINESS DAYS!* If you understand and accept this please check the box and continue checking out. If you do not accept this, please stop and discontinue the order process. Thanks!
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