If it were me I would not mess with that. I would do the bolt in. Unless you do the welding it will cost more to transfer tips and you would need brackets welded to the right location. Its not extremely hard but just sounds like more work then needed. GT 500 mufflers, pype bombs, are cheap flowmasters slightly more. Also if you don't like the sound you will have butchered your stock piping. Just my 2cents.
2012 GT coupe 401a mt82, 3:73, Brembo, D1SC Procharger, BOSS intake, Steeda Ultralite springs, Koni yellows, Steeda bump steer, Steeda adjustable panhard rod, Vossen 10.5 +45 offset with 305 35 20 Cooper Zeon rs3-s