Strong advice - Get your A/F checked after every mod. Especially is you are shooting for a particular ratio. We've seen pretty dramatic changes with some pretty basic mods. I followed my own advice faithfully and only got surprised once. And sometimes that's all it takes.
P.S. - I remember a certain RAI that leaned up the A/F quite a bit before it was modified to correct the situation. Some had to get a retune as a result. Again, be safe. It will be money well spent.