Here is my 1974 GTO with a 389, 6x heads, summit 2801 cam, 3 tube junk headers, 3" mandrel bent exhaust into flowmaster 40 series and then to 2-1/2" dumps
https://www.youtube.com/watch?v=RujRTr7btJY
Then here is all that with log manifolds, tv7101 turbo, all stainless steel hotside and open 3-1/2" stainless downpipe. This was the first startup and if you listen close you can hear the turbo after the revs
https://www.youtube.com/watch?v=hHLo9URR8BI