Just a heads up. I was having some issues with the ohms reading incorrectly on the sxk black billet box. No matter what I put in it (Exocet, insider, Nautilus) they were all reading about a half ohm higher than in the blue BB. I have had the black one for about a month now. The fix was rather easy and something everyone should be aware of. The 510 top piece was dirty. All it took was some soapy water and a good cleaning of the treads on both that piece and the box itself. Remember that is the ground connection on this box so if it gets eliquid or even just condensation in there it will eventually start getting a bad connection. I cleaned it up and everything is staying right on the money now. So CLEAN YO SHIT!!!