Sorry if it took me some time to answer everyone question.
The whole kit with tires, installation and taxes cost me 7000$ total.
Tires alone were 2400$, the installation was 99$ per hour and took 9 hours, Hub Centric 10mm Spacer where almost 300$ (I order them from the US).
On the BDS web site they say that the Dual 5500 Steering Stabilizer isn't suppose to fit with the 4" kit. But the guy at the shop called BDS and they tell him that the steering stabilizer actually fit but they said on there web site it doesn't because a lot of shop don't know how to properly install it with the 4" kit. As for the difference with or without the DSS, I personally don't see any difference so far and will probably not see any unless I go off-road with it.
As for the driving at first it drive kind of rough and weird until I bring it back to re-torque the wheel, which is recommended after the first 100km specially if you have spacers, and after taking it for a drive they notice that the alignment was wrong.
(The shop who install the lift kit isn't the one doing alignment)
They send it to a different alignment shop, one specialized for bigger truck, and after that my truck drove a lot better. If I would have used less aggressive tires then the Trail Grappler it would probably drive just like a stock one!
After checking the new and old alignment sheet they notice that the first shop used the 2011 spec to do the alignment and in addition to that the guy who did it made a big mistake. Usually when someone align a car or truck they set the alignment to be some fraction of degree to the left to compensate because most roads are not perfectly even and tend to be a bit higher toward the center. But this guy set that to the right instead of the left :P
Beside that little hiccup everything look and drove fine