And the car weights about 1000 kg.

http://www.danneeklund.nu/temp/%C4rtan.mpg

How long does such an engine last? So much horsepower is incredible!

such an engine does not last long ..especially if it is the e30 block ..they were hot engines to begin with and did not take boost well ... with the proper boost controllers and a lot of patience during cool down times of the turbo someone who knew what they were doing could make that motor last in my opinion