Replace in GTA SA\data\vehicles.ide
****************************************************
596, 	copcarla, 	copcarla, 	car, 		POLICE_LA, 	POLICAR,	null,	ignore,		10,	0,	0,		-1, 0.7, 0.7,	-1
******************************************
Replace in GTA SA\data\handling.cfg
******************************************
POLICE_LA    1600.0    4500.0   2.0    0.0 0.3 -0.1  75  0.75 0.85 0.50 	5 200.0 25.0 10.0 R P 	10.0  0.53 0 35.0  	1.0  0.12  0.0   0.28 -0.12 0.55 0.0		0.2  0.24 25000 	40000000	10200008	0  1	0
******************************************
Replace in GTA SA\data\carcols.dat
copcarla, 1,1
*****************************************
cheers