I read your comment as if it said "modding a civic makes it unreliable." My mistake. You're right. pre-modded civics are generally unreliable because of the "half ass" attitude of the previous owner. They don't replace things they should, they just go straight for the ebay intake, etc.
I didn't have any problems with my halfshafts...because I did the right thing and got new ones during the swap. first a 40hp increase over stock from the swap, then another 40hp on top of that from the turbo. If they were the original ones, I'm sure they would have broken...but the key is preventative maintainence. If I have a motor out, I replace belts, gaskets, bearings, rings, halfshafts, motor mounts, water pump, clutch, throwout bearing, pilot bearing, bolts/hardware, etc. because it makes sense to do it while it is out.