BMW 335i tuning Okay so a 335i is becoming a real good tuning car and people are talking about it beeing the modern day 2jz. Stock motor can handle shit loads of power and the car is becoming cheaper every year. I am just wondering what the best cost efficient way for tuning is because people are already talking about so called "supporting mods" "cold air filter" "exhaust" and bullshit like that while I just want to know what is effective I mean. I am not really looking forward to E85 or Meth or 100octane tuning or something like that either. I Know you can buy a JB4 piggyback ECU which will actually get you 80 extra horses without much fuzz but what if you want more? And is the stock ECU not tune-able? Could you not just get an extra 80horses by just flashing the ECU you already have? So much questions!