After the car is modded, bringing it back to the dealer is not usually the best idea anyway, it rarely seems to turn out well. Your best off to kiss the warranty away and take care of any problems yourself so you can beef up the car so it wont break again if it was too.
All in all they are very reliable even with making big power, so I wouldn't make it a huge concern unless your selling a kidney to buy the supercharger, that's not the best idea either.
Doug @ ECS