This issue has persisted since the first Forza Motorsport on the original Xbox. The Acura RSX model is very inaccurate and in a dire need of remodeling, including all aftermarket Body Kits available currently in the game.
All dimensions of this car are wrong, but especially the front, as it is significantly too short and placed too high. Overall the car is too big, not just shaped incorrectly but also scaled.
An egregious example of the inaccuracies impacting available Body Kits is the INGS+1 kit, where the front bumper has not a single accurate shape. As if the rest of the kit was much better…
Inaccuracies like these have no place in a modern game. Please do not make the same mistake for any future titles and do not reuse this Forza Motorsport 1 (2005) model any more.