There are a lot of reasons to consider making an upgrade such as larger sway bars. Though, considering the Challenger comes equipped with sway bars from the factory, it may be rendered an inappropriate expense. To decide whether to make the upgrade, you should consider the intended purpose of the vehicle:
Drag Racing: The Challenger is an excellent vehicle for drag racing. In a drag race, there is obviously no turning, so sway bars do work to keep the vehicle flat which is important but in most cases, the factory units will work just fine.
Road Racing: Challengers are big heavy cars and the factory units will have to work hard under the conditions of a road race. If high-speed turns are on the agenda, larger/stiffer sway bars are a must.
Comfort: The factory units will work well for daily use as that’s well within their wheelhouse. If a driver would rather a stiffer more responsive drive through the turns, larger/stiffer sway bars can be installed. Though, stiffer shocks and other suspension components may also be considered to improve these areas.