After some searching, it looks like you'll save about 10-15 lbs. I found this quote in another SVTPerformance thread from 2013.
"Main reason I did not buy the cf hood was price/lbs. the fiberglass version of the a70 is ~30Lbs (feels lighter than that) and was $600. The carbon a70 is ~20-25lbs (never got an exact weight) but $1200."
I can't find the weight of the factory Terminator hood, but I'm thinking arounds 35 lbs.
My cowl hood was all carbon and was about 20-25 lbs while having just pulled the oem hood I put in it’s place it is in the neighborhood of 40-45 lbs. give me a day and I will attempt to weigh it for you guys.
Weight felt is minimal; but it is noticeable.