I would like to put a dmax into an old sports car someday and have been trying to figure out what all I would have to do. Suspension is the one thing i need help with for now. I know the dmax will add roughly 275 to 300 pounds over the weight of the stock engine in the car so i've been trying to find out what capacity coil springs i would need to prevent the front end from sagging or stressing it too much. I have found that you can get heavy duty springs for trucks but havent found anything for cars. Any help would be appreciated