With a little modification, I have hooked up my catalytic converters on my 13 GT to where they are now removable for track only use. The O2 sensors are disconnected right there after the cats. The exhaust is fully exiting out of the stock manifolds. Insanely loud? You have no idea but the benefits on track are greater. The car is track exclusive but I am keeping it street legal so the cats can go back on.
My question for those with experience is whether there is any risk or danger with running the open exhaust during DE or TT sessions? I have the tune to account for the open exhaust. I just don't want ignorance to cause any harm to the car. My hearing is a small sacrifice I'm willing to make.