Went from an 8.75 to a Dana years ago on consecutive weekends when I was racing all the time.
Close to 70 extra pounds.
That said, I saw zero difference on the time slips. I suspect the Dana must be more efficient for it’s extra weight to not hurt the time slip at all.
Regards the frame connectors and cage. Cage might make a tiny bit of difference, the frame connectors you might actually gain some ET from.
Lots to be said for making a unibody car a much stiffer “ one piece” deal.
All these changes I bet you would be unlikely to lose half a tenth, just good upgrades all around.
