Well i'm not quoting any exact ##s but you can test i t yourself with a passenger and without!!I do recall that it's 20-30hp per person aveage lbs 150!Have you ever driven a honda with 4 people in it?The Crossfire wheels LBs vs new after market that weight more you will notice the most off the line!I would say 1/2 sec.-1sec slower depending on how much more they weight.Hence why do you think the SRT has lighter wheels! For faster times.