Anyone had any success or failures from installing a bigger amp (besides the Rockford PBR300X4)? I currently have the PBR300X4 with some Sony 6.5's in the faring and the sound has greatly improved but wanted to go a little further. My thought is to do away with the Rockford add a larger amp maybe the JL audio XD400 with 4 6X9's in the bags. My question is the factory radio. I never listen to the radio, always my iPod, which is run through the radio. I've visited numerous sound shops and they look at the bike like it a flying saucer! I always get the "just bring it in and we'll take of you" line. I've heard that the factory radio puts out a "dirty" signal. Trying not to spend any unnecessary $$$$. Any helpful idea's would be greatly appreciated.