THE arrival of the new 2021 Roush Mustang commemorates the 25th anniversary of Roush Performance Products, with the first Roush Mustang making its debut in 1996. Roush has continued to build on that heritage with proven performance upgrade packages that all hark back to the eponymous Jack Roush. Jack Roush began his automotive career as an engine development engineer for Ford Motor Company in 1964 before going on to establish Performance Engineering in 1976. Relying on his passion for motorsport, and particularly drag and oval racing, Roush began selling designs and components that met higher engineering standards. The 2021 Roush…