These parts are not off a high mileage or junk vehicle. OEM parts taken off of a Subaru WRX 2015 (as part of a modification) after 2 years use and 20k miles. Since 2017 these/this has been stored in a clean garage. I am selling for $825
I am not a mechanic or parts expert. Please know what your vehicle needs and the part you are looking for.
I based my price on some research. A similar used 2015 WRX cat converter is selling on ebay for $1200. The downpipe if bought new from Subaru parts is $636.41 (or roughly $1836.41 for a used and new part together). Both of these parts I am selling are from a used vehicle with 20k miles.