Don't be facetious.. speakers dont weigh 300 lbs. Not any I have ever seen LOL. But all of the creature comforts removed do. I didn't say "speakers" .... I said "all of the creature comforts".... AC, Electric seats, sound deadener, Elec Windows, heavier rear glass and so on......
I'll give you a second chance to understand. Wouldn't you like to know what a ZL1 would do if it simply had the tires and brakes of the Z/28? Give the ZL1 just a couple of the Z/28 upgrades, without changing any of the other issues. Then we see what happens on a "test lap".... not an endurance race. I'd like to know if those famously quoted "3 seconds" would mean as much if you just made those two changes (tires/brakes). Hell, for a couple "test laps", I'd be curious with just the tire change! After all, those brakes are fairly pricey.