I've just been downloading vehicle mods from http://www.gta4-mods.com/vehicles
i've followed the instructions
i used Spark iV (latest version) to open up the vehicles.img file and replaced the wtf and wtd files with the new vehicle files
i then rebuilt the vehicles.img and saved it however the vehices don't show up in the game
i tried it with the SuperGT which i have on the cheat list on my phone so i can easily spawn it
what's going wrong......
btw... i also ran SparkiV with admin privellages and also removed 'read only' from the GTAiV files