Let me know if you have questions this is a core replacement on the cold side, hot side can remain on the car. You do not need to remove the full manifold but you can if you wanted.
I have new ARK DTS exhausts available if interested.
https://1fastsupra.com/products/ark-performance-dt-s-catback-exhaust-system-w-burnt-tips-toyota-supra-gr-a90-2020-2021?_pos=2&_sid=78bac6c57&_ss=r