I'm an FC owner, 89 vert with a S5 JDM 13B swap, 3" exhaust and fcd, 800cc secondaries going in as soon as today if I'm productive enough.

I had been using an N390 port air bypass valve that I believe is failing on me.

I'm wondering if N390 is a 3rd gen part, I've seen some threads where it's Cosmo, but could have sworn mine was 3rd gen. Also does anyone know if the N390 is rated for higher psi/vac?