Ah cool [emoji16][emoji41][emoji106] I thought it was actually some TRD type special edition ! I'm sure it will be once all finished anyway mate. Definitely get a project thread going on.
In terms of exhaust, you can't go wrong with a 4" HKS Racing Titanium. The mid section isn't titanium from memory but the rest is and it will flow brilliantly for your power goals. I'm running one on mine now after the previous owner sold the Veilside Teardrop Titanium exhaust. I [emoji817]% recommend the both of these!
If budget no limit then how about the ETS too....
https://www.srdtuning.com/product/ets-toyota-93-97-supra-4-0-titanium-exhaust-system/