This is an age old debet, my persnal experance is that i have ran my 95 r33 with remaped ECU (32), fmic, turbo back exst, HKS pod filter, bleed valve on 10, 12 and up to 14 all day every day for 2 years I normaly leave it at about 10 or 12, 14 when racing and had the dyno
run that other SAU's from canberra saw running on 12 well .7 bar, it always spikes to .9 bar then drops back. Stock turbo