Originally Posted by 914kid
I am in the same boat and I love the way a JB4 335i drives but for the time being I have decided against it. This car is fast already and has been decently reliable I am afraid after getting the tune I will potentially ruin the reliability.
Another less "risky" option to look at is that alpina transmission flash if you have an auto.
Lol at the car is fast already.... I was jb4d within my second week of owning the car.. Been 10k miles since. Stock 335 is slow !!