Scooter,
I put the Cobra slip-ons on my 1800R and really like the sound and look and they went on in 15 min. I am also running a PCIII. These have a deep throaty sounds I think...not real high pitched.
I do have allittle bit of popping or crackling going on on deceleration...but I think this is due to my fuel/air mix....I think?? Others fill free to chime in if I'm incorrect.