For those wanting to do twins or use a twin flange design manifold these are the flanges for you. These dual flange will fit all N54s and comes COMPLETE ready for welding your runners onto it, no removable inserts you have to deal with welding in, just get the flange get your tubing and away you go. Basic price is for Mild steel which we recommend for a flange of this length, we also have a SS steel option in the drop down, if you require a more exotic material contact us directly for a price and we can have it cut for you.