I have been wanting a quality interface to connect the Zumo 550 Bluetooth with my stock Harley headset.
Every now and then something comes around that truly works as described.
I would like to share my experience with you about such a product.
I installed the
HD BLUETOOTH BOMM from
http://home.comcast.net/~jbissonette1/site/ It arrived within two days of ordering.

SIDE NOTE:
Now I know why they call it a BOMM...I think it looks like a miniature pipe bomb. (GRIN)
Installation:
It was a simple installation. Just connect the two wires and the 2.5mm plug that are attached to the BOMM.
Installation Time:
It took me less than 15 minutes.
SIDE NOTE: It probably would have taken less if I wasn't sucking on a beer.
My Configuration:
Zumo 550, iPhone, stock HD center console and stock HD headset.
Installation:
Connect two wires and a 2.5mm plug that are attached to the BOMM
It works GREAT!
It's so clear that folks I talk to on the phone don't even know I'm on the bike.
This thing is amazing, inexpensive, easy to install and crystal clear.
My Configuration:
Zumo 550, iPhone, stock HD center console and stock HD headset.


The actual device is fairly small and in my case easily fit with no challenges.
In the top picture you can see how small it is in comparison to the 2.5 mm plug.
No switches, no buzzing, no humming, no interference.
Just plain 'ole good clean sound for the caller and receiver.
IMHO - It works GREAT!
Folks that I speak to on the phone don't even know I'm on the bike.
This thing is amazing, inexpensive, crystal clear and easy to install.