well yea, i know this is a hot topic that has been debated time after time...From the people i spoke with about firing into the cabin, they say they love it. just gotta make sure its completely sealed off.
Now some say, they didnt like it, but usually those are the ones who didnt completely seal it off.
But as many people would suggest, try it both ways and see what you prefer better. Kinda hard to do when you are making a complicated install. But oh well. Anymore info from experienced people are welcome