Wow. That does seem to be quite a bit lighter than I thought it would be as well. I thought that a regular 2SS weighs in higher than that already. Then you added a blower to the front end and I figured it would take it over 3900 for sure.
I guess you did take the exhaust manifolds off and replace them with headers so I'm sure you shaved some nice weight there. Makes me curious to take mine somewhere to weigh it once I get it and it's all stock. I wonder if it would weigh in at less than 3800 then?