imo, keep the neuspeed... it does the job...
Moot point since you decided against buying one, but I bought and installed one and it has been trouble free for me. It's a one piece intake, so no need for MAF insert because it has a small tube re directing air around the MAF element. No CEL for me (2007).
Anyhow, good luck finding a new filter, my 2.5 sounded more aggressive when I had a short ram oddly
I know you decided against getting the injen intake just wanted to say i love mine and have had 0 problems with it since i got it, even made my car sounds a little more aggressive.
Also if i'm not mistaken the p-flo uses a 4" cone. If you decide to get a new intake however abd racing makes an intake that can be changed from a short ram to a cold air if thats something that might interest you.