I tried MMP Stage 3 twin turbos, but never felt the “wow” factor I was hoping for. After worrying about wastegate rattle and smoking turbos for too long, I decided it was finally time to go big or go home. Meet the Doc Race N54 single turbo kit.
Once I decided to convert my N54 from twin turbos to a single turbo, I spend countless hours researching what kit I should go with, which parts needed to be replaced, what upgrades needed to be done, etc.
To save you that same hassle, I saved my parts list and will share that below. With this complete list, I was able to safely make 749whp on the stock motor in my BMW 135i.