My car was factory built (2years ago) and I was never asked my weight, I did ask them about flat floor and corner weighting and they said that they are not set up for it, so I took it to Boss racing and had it done by Rob, it takes about 2-3 hours and you can watch him do it and you get a proper print out sheet so you can refer back to if you need to check it's still correct, he can set it up for track, road or any where inbetween. My set up from the factory was well out on everything.