If its putting out 166bhp then it won't be remapped, its more likely that it is making a little more than stock power & has been put on an optimistic dyno.
What engine code is it? Depending upon that you should see 200bhp with a remap as long as your car is running well to begin with, i.e. no boost leaks etc. It's also advisable to upgrade to a forge 007p d/v with yellow spring when you get the map done.
Your best bet is to speak to the tuners on this forum & see what they recommend, personally I'd recommend Carbon Chiptuning, they mapped my car, they are great guys & the car is now an animal!