All that and I don't know how much weight was removed and what effects it had on everything: accel, fe, anything else?
Not the first time automotive writers (and nowadays videographers) have gutted vehicles. In the end I always wonder, "Why did they not simply get a bike (or scooter or motorcycle)?
Back in the '80's Hot Rod magazine had a series of articles where they stripped weight from some otherwise stock car, ultimately ending up with no body whatsoever; IIRC just the firewall and dashboard. My cousin did that to some heap he had access to and I'm told nobody, NOBODY could touch him in a drag race.