Quote:
Originally Posted by xlr8tion
me too! 2009 montego blue 135i Has anyone here install a jb4 tune from burger motorsports or familiar with this. Am strongly considering it as I want to hit the drags this summer and would like to hit mid - low 12s. Open to suggestions or experiences if your willing to give up your secrets :-)
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I have jb4, I installed it myself. And I love it.
The difference between dinan stg2 vs jb4 was crazy!