I just called my KTM dealer in Massachusetts and gave him the two part part numbers you provided (thank you for that) but he indicated availiability dates were not listed so he's uncertain when they'll be in.
I had also ordered an Ankrapovic Titanium Slip-On exhaust but the titanium header pipe arrived instead. The header pipe sells for $840.00 (ouch) and the slip-on is in the same neighborhood and won't be available until the end of July.
Rick
