i have an oil pressure guage on mine taken from the oil filter. from cold it sits just above 3bar, once hot and oil cooler kicks in it drops to around 1 bar on idle and around 1.5 bar under load
well i had to extend my pipes, the guy a pirtex said they need to be done properly due to the pressure. but i just used jubilees and it's fine and has been for 8months now