I doubt you will notice much if you drive normally and it will like you say add weight, only a little, but still weight.
They are fitted for racing and high performance handling on the limit to stiffen up the suspension towers to stop the natural flexing, I think most fit them just for show, if it was an absolute necessity they would be fitted as standard.
Very good mod imo, noticed the difference on mine instantly, car feels much more planted on turn in & generally 'tighter' at the front, we all love the go-kart type handling of our cars & these just make it better .
I had one on of my other cars, a Peugeot 205 16v Gutmann, I couldnt feel any difference to speak of comparing before or after and that was fast, perhaps because it was so good anyway to start with.
I think some of its down to the placebo effect, youve paid a fortune for it so it must work.
I wont bother on the MINI.
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