There are 2 main options. Go 2bular headers / larini / Komotec etc and remove the oem manifold cats. You will then need a good Cat further down the system that will get you through the mot. This, route, if done correctly will free up the engine breathing and gain power. Will prob need a remap to get the best out of it. It will cost though!
cheaper option, and what I did, and the majority of owners, is to select a nice sounding and free flowing rear box and remove the 3rd cat, which is not necessary anyway to pass emissions test and mot, as there are still cats in the manifolds.
The 3rd cat in the later Evoras was removed anyway as it was not required for uk markets, I think US needed it.
Loads of options out there and loads of different price points. If money was no object, I would go full system, ie manifolds, down pipe, single decent sports cat and decent rear box.
My mod money is now in an Emira and my 2010 Evora will stay as is with decat and 2bular box…..first word problems, I know.