Originally Posted by RollingLower420
So what is the safest tune for your engine that has the most HP benefits?
Is JB4 safe for your engine?
the JB is a safe tune but any time you push the output of the engine (stock or tuned) there is always some risk. As long as you are responsible, it should be fine. I had JB on my E90 335 (full bolt on parts too) and drove the piss out of it for 3 years and it held up fine.