As we get Amys' car faster weight placement has become the new learning curve. 2013 her then new best speed of 144. she commented on the rear of the car feeling light so we add 145# of lead the rear bumper frame ('91 camaro) 2014 new top speed 159.348 she was happy with the added weight to the rear and the car was on "rails", her words. totalt car weight 2665# wet. this year looking for about 185.0mph then we'll see. don't want to get it much heavier. my 2cents.all I got.