The Stage 1 Mustang is the introductory model and the foundation from which all ROUSH "Stage" Mustangs grow from. It features the ROUSH styling at a price point. The ROUSH Stage 1 features a vast array of exterior styling enhancements including the 6th generation body package, referred to as the “R6” aerobody package.

Starting at the front of the car are the newly designed ROUSH upper grille, high-flow lower grille, corner fascia aero pockets with driving lamps and front chin splitter. Moving towards the back are the ROUSH rocker panel and rear fascia side splitters to give the car an aggressive, low stance. At the rear of the car sits the ROUSH three-piece rear decklid spoiler giving the car a sleek look without obstructing the view out the rear window. Rounding out the tail end is the new ROUSH rear aero valance featuring race-inspired diffusers and integrating ROUSH’s new dual chambered, chrome exhaust tips.

Exterior identifiers include a ROUSH front windshield banner, Stage 1 badge in the upper grille, ROUSH "R" fender badges, and on the rear decklid are a Stage 1 badge, a faux gas cap "R" badge and finished with Jack Roush’s signature graphic.

Interior branding touches on the Stage 1 contain ROUSH embroidered floor mats, a ROUSH center console button, a Stage 1 dash medallion, Jack Roush's signature graphic on the dash and under the hood is a serialized Stage 1 plaque.

A broad selection of optional equipment is also available for the Stage 1 including exterior body, interior, suspension, braking and under hood components.