I'd say 15.9-16.3 is a good range estimate.

HP, flywheel, 115 if you are lucky. Real lucky. 109hp is for a brand new, factory fresh car. Those do not exist today, so I think 105-110 would be a better guess.

The only way you'll ever really know is to dyno it and run it at a track... I'm getting my RX-7 dyno'ed this weekend, and I'm expecting around 110-120 RWHP from it. I don't even want to know what my Civic would run.