Adding skinnies/removing seats- Drag racing

The skinnies will get you a just under a tenth gain. As far as removing seats I only have done the rear for a 40+/- lbs saving.
So the 2 together maybe a little over a tenth.
Now this is my experience with my car and you will get many say otherwise.
I have run with stock and skinnies on the same day quite a few times. And on average say 3 passes to 3 passes the gains are a bit less than a tenth every time.
The passenger seat I don't remove as that disables air bags.
The rear seat removed at the track was about .02 on average the three times I did that.
Still any gain is a bonus, a 10.5x sounds better than a 10.6x .😉

No not 2 tenths for the 40lbs. More like an average of 2 hundredths. So a tenth or a little better for both.
A bunch of small things do add up though.