Rockstars original Stretch limo,

replace the following files,
Stretch.dff
Stretch.txd

and these lines

vehicles.ide
409, 	stretch,	stretch, 	car, 		STRETCH, 	STRETCH, 	null,	executive, 	5,	0,	0,		-1, 0.75, 0.75,		0

Handling.cfg
STRETCH 2200.0 10000.0 1.8 0.0 0.0 0.0 75 0.60 0.8 0.5 5 180.0 18.0 25.0 R P 10.0 0.40 0 30.0 1.1 0.07 0.0 0.35 -0.20 0.5 0.0 0.2 0.72 40000 282000 10400001 1 1 0 

Credits:
Gangsta-Mummi(ME) for moddeling
Aboodilatif for the last touch and testing