Not the furry kind but the exhaust kind. :wink: Was hoping the p0420 was just another O2 sensor but the cat sounds like a bag of marbles now lol. The car is running fine going by lap times, so I have time to budget and plan properly. I am using this as the motivation to no longer worry about street legality for the track car. An aftermarket header will affect my TT classing but I can manage that by making other changes, so I am thinking of going catless. I assume this would need a tune or would a tune later be fine? Is this still commonly considered the best option? I am not going to be using it on the street anymore but will be towing to events so no need to pass emissions and noise can be managed by the exhaust I stick on after it etc. so just looking for best bang for buck and power 4.5k rpm and higher.