All depends what you now have on your car ... then I recommend you make a search here ... once you do you will find tons of recommendations on mods. I understand in Dubai you have this fantastic BMW dealership, I am sure there is a "Performance Manager" in that dealership if I was you I have a coffee with him/her and discuss your needs on the subject of performance mods. Then there are the fellows with tons of money in Dubai that meet at the track, bet they can help as well. Good Luck and enjoy your car.
Here is an example search ===>
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Here is another ===>
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I like to keep my cars stock ... it's a German thing
we purchase a car that meets our needs.