Sounds like you are talking extended warranty vs CPO. They are different products. And if you already have 5 years on your CPO, the "extension" would only cover another 2 years. Worth the $$ to you?? Also, you would need to read carefully what's covered vs excluded. CPO isn't bumper to bumper, and probably extended warranty isn't either.
2014 328i xDrive | Black Sapphire / Black Red Dakota | Sport Line | Premium Pkg | Lighting Pkg | Cold Weather Pkg | Driver Assistance | Nav | Sport Automatic Transmission