Well . . . I'm sure happy that you came to the forum before you opened your wallet at the stealership! I can't even imagine how they came up with a $1600.00 estimate! If you already have an SRT6 there is no O-Ring needed. Just buy another throttle body (that's assuming you actually need one) and install it. About a 15 minute job . . .

Let's start at the beginning . . . What is the trouble code that triggered your check engine light?