Safe is good, these people who have huge power have the facilities to rebuild and the knowhow etc, people like us need to watch what we are doing because its an expensive mistake to run too much boost if your internals arent uprated and your fuel etc isnt mapped for it.
Grovit, no my car is a 95 STI RA and the bottom end is a new sti 7 one with a semi closed deck block and slightly different rods and pistons than the classic sti ones. The man who built it told me not to run anymore than 1.4 bar boost, although stronger its still a standard set up. I would be a fool to disregard his advice. If you are going to uprate your car, you must keep it within the bounderies dictated by the internals of your car or its life will be short lived. There are people on here and other sights whose knowledge is far greater than mine, my advice to you would be to do some digging, find out the safe working limits of modification your car would take and work within them, if your not happy, dont do it until you have all the facts. The net is full of hard luck stories brought about not by stupidity but by people uprating cars and not knowing the whole story, which leads to an early retirement of thier engine, yes do it, but do it safely and always look at how old the engine is and how many miles you have. Good luck!
Callum