Here are my two thoughts on it:
1) If i spray it before the MAF, it will quickly go lean for a split second until the MAF can tell the EEC to add more fuel, then it would balance out and I should be okay. But I am also thinking that the nitrous itself could cause problems with the MAF, as it really wasn't designed to have anything other than air pass through it. So tiny droplets can't be good over time. An d i really don't wanna break my nice new blowthrough MAF, lol. Of course, if that's truly not a problem then I'd rather go that route because it's easier.
2) If I spray it after the MAF, then I am protecting my MAF from getting hit with nitrous. It would also avoid that temporary lean spike that would occurr when the nitrous first hits. To avoid the "lean" problem, I would simply tune it to be a bit richer when running the "nitrous tune" so that when i spray (only a small 25 - 50 shot, remember) it would balance out. All I have to do is select the nitrous tune when i want to use it, wait 1 second, and then I'm good to go. Then switch back to a normal street tune he rest of the time.
So that's what I ahve been thinking and thats why I can't really decide.
Of course, if it definitely won't hurt the MAF sensor, then that is the easier route for me.