I have a good idea how the whole turbo works but the only part I dont understand is the wastegate and boost controler. Some ppl say you get a spring to regulate your boost and then you turn a nut and others say you use a boost controller. If u get a upgraded spring will that be the maximum boost or what you can boost from? Thank you for clearing this issue up for me. Also I am going to be running 20-25 psi on a b20 no vtec turbo engine. What would be a good turbo for this application. Thank you.