I just wanted to share some web based software I wrote. I have finally gotten around to making it here to let everyone know about it. I welcome any and all feedback. As of about 10 minutes ago, I added the feature to do twin turbos or even quad turbos for those who are into that. 
EDIT:
It seems I can't post any links yet, but it is the Squirrel Performance link in my signature and just click on TurboCalc

EDIT:
It seems I can't post any links yet, but it is the Squirrel Performance link in my signature and just click on TurboCalc