My friends dad just bought one for his 2004 explorer v8. After he put it in, we teased him that he wasted $65 (of course he did not believe us). He went for a test drive to see his new found "power", while we waited for him to return so we could tease him more. When he returned, we asked him if he could beat vettes with all the new power. He told us to stfu as he opened the hood and tossed it in the box and took it back to the store. He came back with a few cases of beer, which we all felt was a better way to spend $65.