I was just at RPM Cycles in Ventura a while back talking to Gary Krieger the owner.
He has an original 99 DPY S that his mechanic ported...$300...he sez with the porting (no twin plugging), a 2Bro exhaust he gets 3rd gear wheelies...also claims money better spent than SJBMW's set-up.
There's a thread:
http://forums.pelicanparts.com/showthread.php?threadid=197825&highlight=porting