I’ve performed a secondary CAT delete on a V12 car I have with no adverse effects
I did the same on my V8 Vantage, couldn't be happier with the results (but there I have an exhaust with the valve)
I was not aware that the Aero had a secondary one (but noisy enough wiht the side pipes).
Does it have some sensor on the sec kat? EarlierVantage had it.