Just got my XiED's and installed them (took about 2:00 minutes!) and I bought these just by reading all 46+ pages elsewhere and all here. All I can say is ....
WOW
You all were right. As soon as I fired up my bike, I noticed the lowered tone of my pipes. Not mind blowing low, but noticeable. Throttle is snappy as all get out

Good goobly goo I'm one happy rider here

Best $100 I've spent on my bike since my lowering kit!