I have the V&H Straight Shots on an '08 and they were just what I was looking for. Stock length staggered pipes with a louder but mellow sound. I used the V&H fuel pak, did all the work myself and gained about 2.5 MPG. I didn't notice too much power change but it will feel a little different with the reduced back preasure.
Thanks for the tip, I will probably go with these ones, did you really had to install the fuel pack?