I would do the tune first, IMO best bang for your buck. Sounds like you will have future mods down the road so you may want to consider someone like American Muscle with tunes for life until your done modding and then get a more dialed in tune. If you buy the SCT from AM you basically get the tune or tunes for life for free.
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m235i, JB4 Stage II Map 2, cat delete, CAI
2012 5.0, GH Dyno Tuned 422rwhp 388rwtq (sold)
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