You have to try it first, and feel the difference.
In my case, narrow rear trackwidth (261mm ) make the car less stable. The push is still there, and possible lost of traction in some less grippy corners.
On Road : Xray NT1 , RX8 , T4 || Mugen Seiki MRX4-R , MTX4 , MTX3 prospec || Tamiya M03 , M04 || Top Racing Sabre FD2
Off Road : Xray XT8 || Hobao Hyper 8
Radio : Futaba 3PKS || KO propo EX-10 eurus