Ok- bare with me guys- im still knew at this. I am getting ready to buy some kind of boost controller for my 91 Stealth TT. I was looking at the Blitz controllers buy i have a question. Im not sure exactly how these controllers work and i don't know what the difference between a single soleniod and dual soleniod controller is. What is it that makes the dual better than the single- any help would be great- thanks.