As a pilot for one of the major airlines and having a few properties in Boroimhe , I can assure you that a new runway will not make much difference to noise levels in this estate. The new runway is planned to be parallel to the old one and although it will be north of the original runway, it will be only slightly closer to Boroimhe. The main runway in Dublin is R/W 10/28 which is 100 degrees and 280 degrees, effectively East/West. Boroimhe is north of this main Runway and not in the take off flight path. The other Runway is 16/34, rarely used and also not in the take off flight path.
I am also hopeful that the Metro which will be stopping at Nevinstown adjacent to Boroimhe and airside offices, will have an effect on property prices in the area. At worst the Metro will prevent property prices in Boroimhe dropping as much as other areas.