I just mocked it up in the best tucked in position to clear the transmission cross brace... then tack welded it and pulled it out to finish weld it... no leaks on the flex and to fit the 2.5 pipes without more custom work they where the easiest way to go.
I used Hooker Long tubes, then 2.5 inch pipes, and 40 series mufflers.... but the best thing I did was installing a crossover to get rid of the drone.. and getting the 2.5 in was a struggle on space and clearance.