Yeah, I think the idea would be to get all performance enhancements done before you do a tune. Otherwise if you change something performance wise on the engine, then some of the parameters the tuner used may be different after you change something after the tune. So you may have to get yet another tune to accommodate every change you do. So obviously you need to plan ahead so you don't waste your money having to do multiple tunes.
Which is why some people buy their own tuning software. So they can do that themselves. But beware, from what I have seen it's a pretty steep learning curve and definitely some butt biters lurking in that endeavor.
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