Wrecked S550 Mustang GT Rebuild: Road Race Project!

The foundation of the project is a wrecked 2016 Mustang GT S550 that was purchased locally after sustaining a front-end collision. The car had already been through an attempted repair in the past, but lingering issues, especially electrical and wiring-related problems, left it far from road-ready.

 

Rather than starting with a pre-built or partially modified car, Derrick wanted a clean slate. He and his family had previously looked at several rebuilt Mustangs in the DFW and San Antonio areas, but most came with unknowns or inconsistent repairs. The salvage GT offered a chance to control every step of the rebuild from the ground up.

 

The car had significant damage concentrated in the front end, including the bumper, driver-side fender, and components around the radiator and intake area. It also arrived with a mix of aftermarket and GT350-style body parts from previous repair attempts, which Derrick used as an opportunity to experiment with the build direction.

 

One of the early decisions was to run a GT350-style front bumper designed for 2015-2017 Mustangs. While not a perfect OEM fit, it worked well enough for an aftermarket setup and helped define the car’s new look as the project progressed.

 

One of the biggest hurdles in the rebuild wasn’t mechanical, it was electrical. The car initially suffered from major communication issues between modules, including the steering column control module and power steering control module. These failures were tied to the vehicle’s CAN bus system and made the car difficult to diagnose at first.

 

After extensive troubleshooting, the issue was traced back to two damaged CAN bus wires located near the airbox. Once those wires were repaired, communication was restored and systems immediately began functioning normally again. What initially seemed like a major electronic failure ended up being a relatively simple fix once the root cause was found.

 

Alongside that repair, several sections of the wiring harness were cleaned up and re-taped, damaged brackets were repaired and welded back into place, and missing or broken components such as the hood latch and AC condenser were replaced. A stock airbox was also reinstalled to help stabilize the engine bay and ensure everything was operating as intended.

 

With the mechanical and electrical systems stabilized, attention shifted to bodywork. The car had multiple dents, paint imperfections, and damage from both the original crash and time spent at a salvage yard. Areas along the door and quarter panels required filler work, sanding, and primer to restore a smooth surface.

Some dents were removed using paintless dent repair, while other areas needed more traditional correction. The rear bumper and valance also showed signs of forklift and handling damage and were either repaired or earmarked for replacement as the build progressed.



Prep for Wrap

 

Inside the car, years of exposure and storage had taken their toll. The interior was heavily soiled and required a deep cleaning and partial disassembly. At the same time, the seatbelt pretensioner system needed to be reset after deployment, which was causing an airbag warning light on the dash. Once that system was repaired and reprogrammed, the remaining warning lights cleared, and the gauges began functioning normally again.

 

After roughly two and a half weeks of work, the Mustang was fully wrapped and reassembled. The final result is a gloss mint 3M vinyl wrap that shifts slightly in different lighting and gives the car a completely new personality compared to its factory appearance.

 

The build now features aftermarket aero components including an APR front splitter and rear spoiler, along with SVE forged wheels and a performance tire setup. The look is intentionally aggressive and personalized, reflecting Derrick’s own vision rather than a factory-style restoration.

 

With the exterior complete, focus shifted to performance and handling. The car received SVE lowering springs, Steeda Pro Action shocks, and Steeda caster camber plates to improve alignment and cornering capability. ARP extended wheel studs were added to accommodate wider front wheel setups, while Steeda and BMR rear cradle lockouts helped stiffen the chassis for more predictable handling on track.

 

Additional modifications include tow hooks, side markers, and minor aesthetic adjustments that tie the build together while supporting its intended use.

 

What began as a wrecked S550 Mustang GT has become a fully functional, road-ready build designed for track use and enthusiast driving. From electrical diagnostics to bodywork, wrap installation, and suspension tuning, the project represents a complete transformation driven by hands-on effort.

While this was Derrick's project, he didn't tackle it alone. Along the way, several members of the LMR team lent their expertise to help bring the Mustang back to life. Fellow employees assisted with electrical diagnostics, fabrication, welding, and mechanical repairs, while Derrick's dad and brother spent countless hours helping with the bodywork, vinyl wrap, and final assembly. The project became a true team effort, bringing together employees from multiple departments who all played a role in getting the car back on the road.

 

For Derrick, the car is more than just a rebuild, it’s a personal step into road racing and a platform to continue learning and pushing his driving experience further. With Mustang Week ahead and HPDE events on the horizon, this S550 is just getting started!