Forza 4 DLC's from torrent "Complete XBox360 Games DLC", sorry not tested.
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Code:
https://openload.co/f/w5ujqRjFQHU/2013_SRT_Viper_Pack_%2B_Forza_Horizon_Challenger_392.rar
https://openload.co/f/4eB_oNePN_w/April_Alpinestars_Car_Pack.rar
https://openload.co/f/JJRKfli2H5U/August_Playseat_Car_Pack.rar
https://openload.co/f/1p_ZzbOaag4/December_IGN_Pack.rar
https://openload.co/f/HCZC1Zziouc/February_American_Le_Mans_Series_Pack.rar
https://openload.co/f/eQAyYQ_v4p4/Hyundai_Veloster_Bonus_Pack.rar
https://openload.co/f/HEoW4lzEN0Y/January_Jalopnik_Pack.rar
https://openload.co/f/V_dKq3x1jTU/July_Car_Pack.rar
https://openload.co/f/XLMNcde6J14/Launch_Track_Pack.rar
https://openload.co/f/FIegGChp2gQ/Limited_Collector%27s_Edition_Pack_%2B_Launch_Bonus_Pack.rar
https://openload.co/f/0bqzkV-NzvY/March_Pirelli_Car_Pack.rar
https://openload.co/f/6SpILnC5z7M/May_TopGear_Car_Pack.rar
https://openload.co/f/_7LwNsJ6bVI/Meguiar%27s_Car_Pack.rar
https://openload.co/f/v-jdggoiFxs/November_Speed_Pack.rar
https://openload.co/f/c8LBfLTArOM/Porsche_Expansion_Pack.rar
https://openload.co/f/LTMYctxl8pw/September_Pennzoil_Car_Pack.rar