This engines can run a lot more then that on standard internals.
250, 260bhp even upto 300 or so, so 180 is a daft figure.
A good remap wont damage the car but it may show weakness.
Say your clutch is on its way out and is just holding on a remap will make it start I slip but if it does it means that you woul have had to change it soon anyway.
Things probably will pop up that need fixing but the same things would have popped up a month or so later.
Just custom stage 1 done at a reputable place tht specialises in vw and 1.8t's like r-tech, badger5 etc and avoid any generic crap like revo or crappy backstreet garages that claims they can increase the horsepower of any car by 50bhp.