Hey Jim,
Have you done any of the '06 HK radio updates with the HW amps in the '04 & '05 SEEGs? I'm saving my pennies for this update.
Yellowsedeuce
Yeap, Neal remembered correctly, that's what is in mine. It's actually a great combination too. The amplified radio we have stock in the 04 and 05 bikes has a larger amp than does the HK radio by itself without its rear amp. So when you go from the SEEG's 04 or 05 radio to the HK you'll notice a little less overall volume. Not a lot, but a little. From a stock bikes radio prior to 06 the HK would be an improvement by itself.
The HK radio from the 06 bikes when combined with the HawgWired amp kit is sweet though. Clear audio through all the ranges I can hear. It works great. And there is greater audio output than you're ever going to need. Not only can you still hear it at 100 mph, the guy on the bike behind you can too if you wish him too.
If you're really interested in superior flexibility for the audio system that all fits inside the fairing without gettng too warm or pulling threatening amounts on the charging system than sticking the 06 HK radio and XM kit and the HawgWired amp kit in your previous model years bike is an elegant solution.
Check out the FLHTCSE section of the site. There are threads that illustrate and describe the installs of each along with quite a bit of conversation on both of the products at the time.
HD-Dude has dealt with many of the amp installs now too. So hit him up for all the details you may be wondering about. He can also save you a bit of money off the mftr's price too.