Does a drag race only car need exhaust boxes?

years ago when I had my 70 Duster,( factory 340 air car) I raced it with 8 point mild steel cage, frame connectors, all steel except bumpers( so likely 50 pounds savings total there.
full bench seat/ carpet interior, full stock gas tank full of gas( didn’t want any slosh, no spare tire, I weighed probably 310 at the time, car weighed almost 3450 at the line with 3 inch exhaust out to the back, 727 transmission.
3850 is something I would love see go over the scales at my track, 400 pounds more than mine weighed( and I weighed more as a driver) is something I would stand at the scales and bet 100 bucks on
I try to weight most of my cars and my darts usually weight in around 3450 -3580 stock with at least 3/4 tank of fuel. These have been G/T's (bucket seats/consolewith no options. Stock exhaust. My dusters were always lighter 100 -150 lbs. I currently want to weight my 69 Cuda, 340 Auto. Dana 60 8 point ms cage all steel. I'll bet she;s 3650 or so w/o driver.