Quick ramp up, I'm running a dual coil, twisted 30g 3mm id @ .4ohms. On a Kennedy Competition clone, chucks clouds and rich flavor. I'm new to building duals, and for a mech, but I use steam engine to calculate a build for between 3.7 and 4.2v (I shoot for around .4ohms, and make sure I am hitting a good heat flux between 34-44 watts). This is probably the 4th or 5th build I've tried and am really happy with the results.