Really, never had a problem with that.
Yea, but wasn't your car dyno
The tuner could adjust for your setup some right there and compensate to keep your a/f trim nice and flat. Some guy on here with no tune, or only getting a "mail order" tune can't adjust for that and as a result would run slightly lean from sucking in the unmetered air. It would be the same as if there was a large vacuum leak, as the MAF is not registering the extra incoming air. Know what I mean?