In this part of the StealthBuilt Audi A6 Widebody Build, Sam Kimmel dives into the final form-shaping of the rear bumper, experimenting with diffuser designs, center brake lights, and even prepping the panel for mold-making. This chapter blends high-speed creativity with deep craftsmanship—and a whole lot of cardboard. Mocking Up Rear Diffuser Designs with Cardboard…

In this step of the StealthBuilt Audi A6 Widebody Build, Sam Kimmel answers a highly requested question: “What kind of filler are you using—and how?” From mixing techniques to custom consistency adjustments, this episode is all about the art of smoothing, shaping, and prepping custom fiberglass panels for final finishing. Whether you’re building a widebody…

In this stage of the StealthBuilt Audi A6 Widebody Project, Sam Kimmel and the Kimmel Fabrication Studio take on the task of designing the rear spoiler mount. As with the rest of the build, the goal is to prototype, experiment, and refine through a hands-on, cost-effective process that encourages creativity without breaking the bank. Starting…

In this chapter of the StealthBuilt Audi A6 Widebody Build, Sam Kimmel takes us deeper into the finishing stages of the fender flare construction and rear bumper development. With a mix of cardboard templates, hot glue, and fiberglass matting, this video shows exactly how to refine a DIY widebody kit with pro-level techniques on a…

In this chapter of the StealthBuilt Audi A6 Widebody Build, Sam Kimmel returns to the rear of the car to refine the bumper, test diffuser layouts, and lock in the final design for the rear end and fender flare transitions. What makes this stage unique is how much input came from the online community, with…

In Part 5 of the StealthBuilt Audi A6 Widebody Build, Sam Kimmel takes us to the rear of the car, where a full custom diffuser and widebody-friendly exhaust system are being hand-built from scratch. If you're into fabricating body panels, welding your own exhaust, or making mock-ups using cardboard and particleboard, this chapter delivers serious…

Welcome back to the StealthBuilt Audi A6 Widebody Build! In Part 4 of this extreme custom series, Sam Kimmel walks us through the critical next phase — building out the side skirts and laying down the first layers of fiberglass for the front and rear fender flares. If you're planning a custom body kit or…