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Master? There's really nothing to master. You plug it in and follow the menus. It's easy to operate. Here's a video that shows how to load a tune with an XCAL2: http://www.brenspeed.com/tech/loadingtunes.wmv
I dont understand if you mean master it, as in be able to make your own custom tunes or what not or just load a tune and know what your doing haha
Yeah, I think they're referring to the ability to write your own tunes. He/she wants to know what knowledge and equipment are needed to write your own custom tune that you can then upload to an SCT (or other tuner) and put it on your car...
...and actually make the car run well . Blowing up the engine doesn't count...haha