Hello , I have a Scion tC 2012 . Recently, about 2 weeks ago my car is making a very rusty/scratchy noise when I turn my car on . when I’m warming my car up , now I hear the noise as I accelerate and or is idle at a light /stop sign ect .. I took it to Toyota and they said everything checks out fine , besides me needing one new tire. Sounds like it’s coming from me engine/ exhaust . I have no clue ! I just know something Is major wrong , deff not fine . Can anyone help me with this issue ! Or maybe have a guess in what it could be . I do know I need a tune up maybe ! Really hope someone can help ! this car is my favorite ! I would hate to get a new car !