Rye_conquest18

I'm thinking about upgrading the turbo in my Conquest to an HKS 2835 GT. When doing this, what should I do to make sure my engine can handle the extra boost? Where can I get a good intercooler, what would be the best company to choose from? Should I put the time into an electronic boost controller? BY the way, the turbo is guessed to boost the car to about 350hp. Also, should I have a 2.5" or 3" exhaust for this application? Ryan