Many people say our Bezza is terrible….do you think its true?

Can share with us some tips and tricks on how to make the Bezza drive better? I was reading online about those bars, have anyone here installed it and seen the results?

Pic taken from fb. actually they say still got more but im not sure if really need to do the whole set or not…

And then for tyres...these are the standard ones, anyone know if can go wider than this? FEel like the car feels very high and not so stable at high speed using these standard things…