YOU CAN ADD ANY TYPE OF AFTERMARKET UNIT BUY USING A DASH ADAPTER MADE JUST FOR A INTERSTATE ! BUT TRY TO FIND A UNIT THAT ALSO HAS AN AUX INPUT !!THIS WILL ALLOW YOU TO ADD A MP3 PLAYER AT ANY TIME (YOUCAN GET A CHEAP ONE FOR UNDER $25.00 THAT WILL HOLD UP TO 500 SONGS ),THAT YOU CAN LOAD SEVERAL HOURS OF UNINTERUPTED MUSIC , AND NEVER HAVE TO WORRY ABOUT IT SKIPPING DUE TO DIFFERENT TYPE'S OF ROAD SURFACES !!
P.S BECAREFUL OF HOW MUCH POWER THE UNIT PUTS OUT IF YOU STILL HAVE A STOCK STATOR !!
gp - don't bother with CD. It sits so high in the dash you may have skipping, and they are a pain to change on the fly. I put a unit in that had AM/FM/USB/SD/AUX input and never wanted a CD. With a 2GB SD card in it I rode from Cleveland to Sterling, Va and back (800 miles) and still didn't get back to the begining of the SD card. Also, the CD units will stick out of the dash 1.5" more than non CD units. I put new Pyle speakers and radio in mine for $130. Install was listed in this thread...lots of help from the forum here.... http://www.goldwingfacts.com/forums/forum1/61167.html
Speaking from experience here, I have a Sony Xplode on my bike, and I have been looking to get rid of it since the first day I threw a disc in it. The warmer it gets the easier it skips. I am lucky enough to have the AUX in on the front of the unit and I plug in an MP3 player and use that instead of a disc.