Depends on the mapper. A good remap will improve the running of the car whether standard or modified.
Does it put any stress on any other parts of the car?
had my 182 chipped by superchips about 8-9 months back.not had any problems.the geezer plugged his laptop into some slot under the tray on the centre console,did some magic,put all my old settings on a new chip for me to keep and off he went.all a superchip does is push the engine components to work to maximum tolerances,which they should work at really but manufacturers like to tone them down a little.doesnt do any harm.