Nissan y61 super safari modifications

So I recently bought a Nissan y61 super safari, in the gulf region. After a few months of using the suv I’ve realised that it does feel abit under powered and the suspension to be on the stiff side. I’m willing to throw in some money for some suspension and performance mods. I’d like to be recommended a good suspension kit which actually improves its on road comfort. As far as the performance mods go, I want the suv to be able to make 400-500 horsepower. Of course with a turbo setup which is both reliable and reasonable. So guys please let me know the best suspensions available and what I can do to achieve the 400 hp mark

thank you.