Thread: TUNE?! F30 335i
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      12-22-2012, 08:43 AM   #16
bulldog x6
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Quote:
Originally Posted by RollingLower420 View Post
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.