200bhp will not need major mods, forget all the bullshit pubtalk stuff,

start with the normal, chip, exhaust, air filter
bigger intercooler, half width will be ok
standard turbo is fine for 17psi
an up-rated cam will help but most of them these days wear out quickly

if your car has enough fuelling to hold the 17psi that should see around the 200bhp mark. if you want a bit more or it falls short of the 200 mark it may need more fuel, this is where a 5th injector is needed & maybe an up rated pump, couple this with a hybrid T3 turbo (stage 2) & you should sail over 200bhp & still have a car that is good to drive