Turbo or charger?

[Bobitupa]

Hi recently been on utube and seen a couple of boxsters with twin turbos And superchargers was thinking of maybe doing this myself but gabby got the faintest idea about where to start or who to see to do it also would it be safe in my 98 model has anyone had it done and where and more important the cost of it all would also like to hear what kind of performance it gives too I'm in the uk cheers bob