for a start a st170 isnt on webbers or a 4 branch its on its own restricted daily driver set up fitting the webbers an 4 branch lets it breathe more freely giving more power
the car is a tiger R6 an was a factory built car it was rolling roaded by tiger before it started to race in the tiger series an produced 175 ponys it isnt all about bhp figures torque,gearing is also very important in accelerating quickly you could have loads of power but if the gearing is wrong it will be slow in compareson to a well geared car