anyone know the difference in the weight of a stock cougar 16"wheel and a 15" wheel...and would the difference be great enough for an advantage at the track?

1999 Cougar V6 MTX SVT UIM/LIM/65mm TB, I/H/E, Fidanza/SPEC III/Torsen, Koni/GC's, 19" Icon wheels w/ Pirelli rubber, NX Wet Kit