MSA road going hillclimb regs...
Body (including aerodynamics)
11.4.1. Silhouette of the vehicle must remain unaltered
in construction, dimension and material. The silhouette
will be taken in the condition in which the car competes
(convertible closed cars competing with the hood or
top not erected shall have the silhouette determined in
that condition).
Personally i think not as the fuel tank is the lowest part under the car so whether the bumper is chopped or not the
silhouette remains the same.
Opnions?