GTR George

Gday RB fans, I'm relatively new to this forum, GTR's and also to circuit racing but have been running my R32 at Winton sprints for almost two seasons without a hitch. My engine has had quite a lot work done such as a bigger sump with wings, 3ltr catch can (located up front on driver side inner guard replacing the battery), cams, rebuilt head, bigger turbos etc. All work done by a GTR guru with 20yr experience. Bottom end is standard I think but "apparently" was new prior to buying the car. 400Kw at wheels. I would like to do some bigger circuits such as Philip Island and Eastern Creek but have been told I must have a 2nd catch can or I risk the engine. Does anyone have any thoughts on why this is necessary and what might happen if I just go for it! Keeping in mind that I have not had any overflow from the current catch can or ever noticed too much oil pressure, except for when the engine is cold. When hot and at revs the pressure seems to run 60-70 psi and at idle 20psi. I'm eager to get on some bigger tracks but prefer to finish the track days with the engine intact.