M50 Northbound
Exit 6 for the N3
Continue straight on the N3 for about 30km
Before you get to Navan there is a pub on the left called Ros Na Ri (Not 100% sure on the name but very similar)
Take the Right Turn BEFORE the pub and continue straight. STi Tuning is done that road on the left. Call Dave after you make that right turn and he will tell you where to turn in for his garage.