tuner

Ok so I purchased a brand new X4 last week and got a custom tune emailed to me this weekend. I loaded the tune up and car did not start so I call the tuner back and tell them so they can make revisions. While I'm waiting I put my car back to the stock tune, now it won't start at all with any...

I'm new to this forum, if this was already discussed and I missed it searching the threads please just redirect me. I am looking around to see what the differences are in all the kinds of tunes that are available and I cannot seem to find anything on the different tunes out there. I am...