@invisiblefriend. Yea, I like the 3.7 volt heating rod better for flavor too. I used that exclusively for the fist year of having my SR71. It takes longer to heat up, but it doesn't burn the taste out of your oil immediately. I do like the 7.4 volt rod that comes with the SR74 tho. It doesn't get as hot as the 7.4 volt white rod that comes with the SR71. The rods all have different resistances and the lower the resistance the faster it gets hot, but if the resistance is too low, u can't use it on 7.4 volts or it could burn out the rod. Someone correct me if I'm wrong, but I'm pretty sure the 3.7 volt black rods resistance is .8, give or take, that's why it gets hotter faster with the higher voltage, but if u go too high, u could fry the rod. I believe the resistance for the white 7.4 rod for the SR71 is around 1.5 ohms, give or take, and that's why it can handle the higher 7.4 voltage without burning out. U can either go with the white rod and if u have the core u can scale it down for better flavor or u can use the 3.7 volt rod and scale it up a little bit until it's right where it heats faster than 3.7 volts, but still tastes good and don't burn the shit out of your oil. I hope this helps ya understand it a little better.