it came off of a v8 durango, but from what i understand v6 or v8 daks or durangos will work.......what was wrong with yours and what year model?.......just a suggestion, i would just do the round air filter....i tried it out today and it feels a lot better than this...this piping is only like 2.25", which i think is holding it back tho.... some cadillac devilles also have the box like this but just slightly different