in order to do that you need to create a custom handling file for that car, then add it to handling.meta, once you do that you can go to vehicles.meta and select the car, just replace the handling to the name you give to that file, here is an example
<modelName>model of the car</modelName>
<txdName>model of the car</txdName>
<handlingId>name you give to that file on handling.meta</handlingId>
<gameName>model of the car</gameName>
<vehicleMakeName />
<expressionDictName>null</expressionDictName>
is a long file so i just post a part of the whole vehicle