Pegassi Infernus settings. 
If you have Modloader then the Vehicles.ide, Handling.cfg, Carcols.dat and Carmods.dat settings can 
be simply installed by copying this file in a folder inside ModLoader directory.
Example: 
GTA San Andreas\modloader\Pegassi Infernus\Settings.txt

Replace the default line in Vehicles.ide with this one:
411, infernus, infernus, car, INFERNUS, INFERNU, null, executive, 4, 0, 0, -1, 0.7, 0.7, 0

Replace the default line in Handling.cfg with this one:
INFERNUS 1200.0 2200.0 1.1 0.0 0.0 -0.4 70 0.76 0.89 0.47 5 270.0 48.0 68.0 R P 5.3 0.46 0 30.0 0.36 0.22 0.0 0.01 -0.11 0.5 0.4 0.12 0.72 95000 40112004 00C04000 1 1 1

Remove the default line from car section of Carcols.dat and add the next line in car4 section:
infernus, 70,69,3,24, 123,6,3,36, 125,108,3,25, 97,97,125,90, 86,0,6,105, 0,93,3,93, 61,0,3,24, 117,53,1,25

Replace the default line in Carmods.dat with this one:
infernus, bnt_b_sc_m, bntl_b_ov, nto_b_s, nto_b_l, nto_b_tw, spl_b_mab_m, spl_b_bab_m, spl_b_bar_l

The vehicle name is defined inside Infernus.fxt. Copy it to CLEO\CLEO_TEXT or your mod's folder in ModLoader directory (just like the settings.txt file).
The file can be found inside Bonus\In-game name\cleo\cleo_text