gtasa/data/handling.cfg(find line)
ZR350        1700.0    3100.0   2.7    0.0 0.3 -0.15 85 0.78 0.85 0.5       5 205.0 28.0 6.0  4 P   6.0   0.52 0 35.0   1.0  0.18  0.0   0.28 -0.10 0.5  0.3        0.16 0.70 100000    40002004    4000001     1  1    1



gtasa/data/vehicles.ide(find line)
477, 	zr350, 		zr350, 		car, 		ZR350,		ZR350, 		null,	richfamily, 7, 	0,	0,		-1, 0.7, 0.82,		1


gtasa/data/carmods.dat(find line)
zr350, exh_a_s, exh_c_s, fbmp_a_s, fbmp_c_s, nto_b_l, nto_b_s, nto_b_tw, rbmp_a_s, rbmp_c_s, rf_a_s, rf_c_s, spl_a_s_b, spl_c_s_b, wg_l_a_s, wg_l_c_s

sultan, nto_b_l, nto_b_s, nto_b_tw
and do the (sultan) just for not fuckin your game up :D


gtasa/data/carcols.dat(find line)
zr350, 0,3, 3,6, 11,1, 42,1, 48,1, 29,0

get that mod car colors make your game more cool ;)
http://www.gtainside.com/en/sanandreas/mods/86342-car-colors-mod/