Replace in Vehicles.ide.
602,	alpha,		alpha,		car, 		ALPHA,		ALPHA, 		null,	executive, 		null,	executive, 	10, 	0,	0,		-1, 0.7, 0.7,		0

Replace in carmods.dat (ignore this if you're installing Add-On tuning parts):
alpha, bnt_b_sc_l, bntl_b_ov, bntl_b_sq, nto_b_s, nto_b_l, nto_b_tw, rf_b_sc_r, spl_b_bab_m, spl_b_bbb_m, spl_b_mab_m, wg_l_b_ssk

Replace in Handling.cfg:
ALPHA 1700.0 4000.0 1.3 0.0 0.1 -0.3 85 0.75 1.05 0.42 5 260.0 60.0 170.0 R P 7.5 0.49 0 30.0 0.59 0.15 0.0 0.03 -0.12 0.5 0.4 0.18 0.50 35000 40002804 00200003 1 1 0

Replace in carcols.dat:
alpha, 3,0,36,24, 6,0,36,24, 90,90,36,24, 53,1,36,24, 121,121,36,24, 125,125,36,24, 0,0,36,24, 34,34,36,24
