I have a 2003 Coupe that I've owned since March and havent had any problems with leaks at all and haven't heard of this problem with the 03's. It's possible that your moldings were flawed from the factory but I don't blame the dealership for pointing to your upgraded speakers because thats also possible. No matter what, nothing is better than OEM. It may sound better but those are universal speakers that aren't designed to fit just your car so their may be fitment issues. Just my 2cents.