I have a 1989 320i, and even though i love it, it feels a bit slow. I know most people say that it is easier just to fit a 325 engine but the engine i have has only run about 23k miles so i want to keep it in.

What are the best way to improve the M20B20 for power??

I have a 1989 320i, and even though i love it, it feels a bit slow. I know most people say that it is easier just to fit a 325 engine but the engine i have has only run about 23k miles so i want to keep it in.

What are the best way to improve the M20B20 for power??