bought a MAF for my car picked it myself, clearly see sign that says no cash returns and understand that policy and why its in place. i installed the maf in my car it didn't work went back to the yard to exchange it for one that worked. I was told that there is no warranty on what I bought and im stuck with it. dont even waste your time they charge too much anyways its not worth it to pick yourself. go to bugs stevens and pay an extra 5 bucks for them to pull it for you and if you have any trouble they will exchange it.