Hey
The shop i go to recommends that i run 2 bovs or a tial 40mm. I just upgraded to a 60 trim turbo. Is this worth it? Im running a greddy type s now. Let me know

 

I suppose it depends on how much boost Over 40 you may want it. Otherwise i think you should be ok. I have seen plenty of Supras with one HKS bov running 30psi and they dont seem to have any problems. I ran 30 on mine with no ill effects. I have a GT35r.

 

There is certainly no harm in it. If anything it is only good for the turbo since you are doubling the amount of airflow on release.