[asperformance]

on a classic car (generally speaking) its unlikely you will have issues with a de-cat, and none at all if its simply the centre section.........

FYI the only classic cars that had a centre cat are the UK spec, all others simply had a silencer box that does look similiar externally

as for the cone filter, then all it adds to a std car is a little noise..........the std air box is actually very efficient and simply fitting the likes of a K&N panel will suffice