A "modified grille" refers to a modified or altered front part of a vehicle that includes the opening through which air enters for cooling the car's engine. Full definition
The exterior looks are mildly changed, with new bumpers front and rear (the front featuring a slightly modified grille and lower bumper openings), enhanced LED lighting and new wheels. (autofile.ca)
Exterior styling changes extend to a lightly modified grille, new range of alloy wheels and revised color schemes. (autoweek.com)
However, in a bid to separate the two cars Tata is likely to modify the grille of the latter. (carwale.com)