Install at x64e.rpf\levels\gta5\vehicles.rpf\ 
using OpenIV

Install dials by editing vehicles.meta at update>update.rpf>common>data>levels>gta5> extract it and open with notepad then press ctrl f and search for  <modelName>tailgater</modelName> then scroll down untill you see VDT_TAILGATER, change it to VDT_BANSHEE, remember to be in tailgater's option and not a different car's 

