I think you have Seen Movie " Death Race 2008"
by the way you have added lot of metal
to add weight
it will surely KILL acceleration ( pickup )
and even topspeed
, brakepad will end up quickly
it will take a distance to stop your car
Even its going to drink lots of fuel
weigh kills cars
only beneficial when on very high speed for better handling
people use SPOILER to increase downforce to increase weight which is directly proportional to wind Blow ( acting on spoiler`s blade)