{"product_id":"kelltrac-adjustable-front-drag-strut-rear-shock-kit-2015-2026-s550-s650-mustang-kti-fds15rs","title":"KellTrac Adjustable Front Drag Strut \u0026 Rear Shock Kit (2015 - 2026 S550 \u0026 S650 Mustang) KTI-FDS15RS","description":"\u003ch1\u003eKellTrac Adjustable Front Drag Strut \u0026amp; Rear Shock Kit (KTI-FDS15RS) – 2015-2026 Mustang S550 \u0026amp; S650\u003c\/h1\u003e\u003cp\u003eEngineered for the serious racer and proven on both track and street, the \u003cstrong\u003eKellTrac Adjustable Front Drag Strut and Rear Shock Kit\u003c\/strong\u003e delivers uncompromising traction, control, and performance for your \u003cstrong\u003e2015–2023 Mustang S550\u003c\/strong\u003e. This complete package combines \u003cstrong\u003eKellTrac’s industry-first adjustable front drag struts\u003c\/strong\u003e with \u003cstrong\u003eKellTrac Ultra Spec Viking Crusader rear shocks\u003c\/strong\u003e—a battle-tested pairing responsible for record-setting 60-foot times and consistent launches on nearly any surface.\u003c\/p\u003e\u003cp\u003eThis combination has been proven to achieve \u003cstrong\u003elow 1.2-second 60-foot times\u003c\/strong\u003e on average prepped tracks and \u003cstrong\u003e1.3-second 60-foot times\u003c\/strong\u003e on basic asphalt surfaces—making it one of the most versatile and effective drag suspension setups available for the S550 platform.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eComplete Front \u0026amp; Rear Solution for Maximum Traction\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eKellTrac took the guesswork out of suspension tuning by pairing their proprietary front struts with Viking Crusader rear shocks, giving you a fully matched system optimized for drag racing performance and repeatability. Whether you’re running naturally aspirated, nitrous, or boosted, this kit provides the adjustability and control to dial in your Mustang for consistent, confident launches every time.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eFront Adjustable Drag Struts\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eAfter over a year of development and testing, KellTrac’s \u003cstrong\u003eS550 Adjustable Drag Struts\u003c\/strong\u003e were designed to be the ultimate single-adjustable solution for serious racers. Developed in partnership with one of the world’s leading shock manufacturers, these struts feature exclusive \u003cstrong\u003edrag race-specific compression and rebound valving\u003c\/strong\u003e for precise tuning on any surface.\u003c\/p\u003e\u003cul\u003e\u003cul\u003e\n\u003cli\u003eDirect OEM replacement designed for street\/strip use\u003c\/li\u003e\n\u003cli\u003eIncreased extension travel over stock struts for improved weight transfer\u003c\/li\u003e\n\u003cli\u003eSingle adjustable valving for fine-tuning power levels and surface grip\u003c\/li\u003e\n\u003cli\u003eRetains factory sway bar (if desired)\u003c\/li\u003e\n\u003cli\u003eCompatible with OEM or aftermarket upper mounts and springs\u003c\/li\u003e\n\u003cli\u003eHigh-strength steel construction with corrosion-resistant coating\u003c\/li\u003e\n\u003cli\u003eZero increase in NVH (Noise, Vibration, Harshness)\u003c\/li\u003e\n\u003c\/ul\u003e\u003c\/ul\u003e\u003ch4\u003e\u003cstrong\u003eFront Strut Benefits\u003c\/strong\u003e\u003c\/h4\u003e\u003cul\u003e\u003cul\u003e\n\u003cli\u003ePromotes improved traction and controlled weight transfer\u003c\/li\u003e\n\u003cli\u003eAllows higher power application due to increased suspension travel\u003c\/li\u003e\n\u003cli\u003ePrevents excessive wheelies and reduces wheel hop\u003c\/li\u003e\n\u003cli\u003eImproves stability, launch control, and handling response\u003c\/li\u003e\n\u003cli\u003eRetains stock-style springs for easy installation\u003c\/li\u003e\n\u003c\/ul\u003e\u003c\/ul\u003e\u003ch3\u003e\u003cstrong\u003eRear KellTrac Ultra Spec Viking Crusader Shocks\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eThe \u003cstrong\u003eKellTrac Ultra Spec Viking Crusader Rear Shocks\u003c\/strong\u003e are a purpose-built evolution of the Viking Double Adjustable design, featuring \u003cstrong\u003eexclusive KellTrac valving\u003c\/strong\u003e for a broader range of applications and ultimate launch control. These shocks use a \u003cstrong\u003espherical bearing lower axle mount\u003c\/strong\u003e for faster reaction time on launch and superior suspension articulation under power.\u003c\/p\u003e\u003cul\u003e\u003cul\u003e\n\u003cli\u003eDouble-adjustable design for independent rebound and compression tuning\u003c\/li\u003e\n\u003cli\u003eKellTrac-exclusive valving for superior drag race performance\u003c\/li\u003e\n\u003cli\u003eSpherical bearing lower mounts for faster response and improved traction\u003c\/li\u003e\n\u003cli\u003eIdeal for street\/strip and dedicated drag setups\u003c\/li\u003e\n\u003cli\u003eMay introduce minor NVH (not for show-only builds)\u003c\/li\u003e\n\u003cli\u003eRecommended with aftermarket upper shock mounts for best performance\u003c\/li\u003e\n\u003c\/ul\u003e\u003c\/ul\u003e\u003ch4\u003e\u003cstrong\u003eRear Shock Benefits\u003c\/strong\u003e\u003c\/h4\u003e\u003cul\u003e\u003cul\u003e\n\u003cli\u003eMaximizes rear tire grip during launch\u003c\/li\u003e\n\u003cli\u003eImproves 60-foot consistency\u003c\/li\u003e\n\u003cli\u003eAllows precise damping adjustment for track and street conditions\u003c\/li\u003e\n\u003cli\u003eProven performance for 7–12 second cars\u003c\/li\u003e\n\u003c\/ul\u003e\u003c\/ul\u003e\u003ch3\u003e\u003cstrong\u003eProven Performance – Track \u0026amp; Street\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eFrom \u003cstrong\u003erecord-breaking heads-up racecars\u003c\/strong\u003e to \u003cstrong\u003edaily-driven street builds\u003c\/strong\u003e, this KellTrac suspension setup delivers unmatched performance. The balance of extension, rebound, and compression control allows for consistent launches and stability, regardless of surface or power level.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eSpring Rate Recommendations\u003c\/strong\u003e\u003c\/h3\u003e\u003cul\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eNA \/ Nitrous:\u003c\/strong\u003e 150 lb\/in Front – 800 lb\/in Rear (BMR or Steeda Drag Springs)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBoosted Applications:\u003c\/strong\u003e 170 lb\/in Front – 800 lb\/in Rear (BMR Min Drop Springs)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e1000+ WHP Boosted:\u003c\/strong\u003e 170 lb\/in Front – 980 lb\/in Rear (BMR Min Drop Front \/ Handling Rear)\u003c\/li\u003e\n\u003c\/ul\u003e\u003c\/ul\u003e\u003ch3\u003e\u003cstrong\u003eIncluded Support\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eAll KellTrac Spec Shock and Strut purchases include \u003cstrong\u003elimited remote technical support\u003c\/strong\u003e to help you fine-tune your setup for your power level and surface conditions.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eWhy Choose KellTrac?\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eBuilt by racers, for racers—KellTrac’s engineering focus is on real-world performance and results. Each product is tested extensively in competition environments to ensure durability, consistency, and confidence where it counts most. If you’re serious about making your Mustang launch harder, go faster, and stay consistent, the \u003cstrong\u003eKellTrac Adjustable Front Drag Strut \u0026amp; Rear Shock Kit\u003c\/strong\u003e is the proven choice.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eFitment\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003e- 2015 Ford Mustang S550\u003cbr\u003e- 2016 Ford Mustang S550\u003cbr\u003e- 2017 Ford Mustang S550\u003cbr\u003e- 2018 Ford Mustang S550\u003cbr\u003e- 2019 Ford Mustang S550\u003cbr\u003e- 2020 Ford Mustang S550\u003cbr\u003e- 2021 Ford Mustang S550\u003cbr\u003e- 2022 Ford Mustang S550\u003cbr\u003e- 2023 Ford Mustang S550\u003cbr\u003e- 2024 Ford Mustang S650\u003cbr\u003e- 2025 Ford Mustang S650\u003cbr\u003e- 2026 Ford Mustang S650\u003c\/p\u003e\u003cp\u003eCompatible with GT, GT350, GT500, and EcoBoost models. Designed specifically for drag race and street\/strip applications.\u003c\/p\u003e\u003cp class=\"pro_warng_msg\"\u003eCA Residents: WARNING: Cancer and Reproductive Harm \u003ca href=\"https:\/\/www.p65warnings.ca.gov\/\" target=\"_blank\"\u003ewww.P65Warnings.ca.gov\u003c\/a\u003e\u003c\/p\u003e","brand":"Kelltrac","offers":[{"title":"Default Title","offer_id":43856176349277,"sku":"kti-fds15rs","price":1654.94,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0712\/4566\/0253\/files\/392db152a93ed0d74624fccdafb65141__07718.1761329299.jpg?v=1764648897","url":"https:\/\/www.byepolr.com\/products\/kelltrac-adjustable-front-drag-strut-rear-shock-kit-2015-2026-s550-s650-mustang-kti-fds15rs","provider":"ByePolr Performance","version":"1.0","type":"link"}