There was a place out in las vegas that used to make custom cones and megs for 2 stroke exhausts. This was around the time that Hi-Performance ATC made their RD350 and RD400 frames, because my dad made his hand made pipes from aircone cones.
Now to present day
I need some cone for a custom exhaust that I'm hoping to fab together. Aircone is listed in 2-3 websites as still a legit company, they have a facebook page (https://www.facebook.com/pages/Airco...63277120450165)with comments (all comments are almost a year old or more) that talk about their pipes. They are supposed to have a website aircone.net but it does not exist. The phone # on their facebook went into a standard voicemail, not "Hi you've reached aircone"
Hopefully a old-school 2-stroke guy will chime in, or anyone that has dealt with them. I may give them a call, as it's only 3:17 on the west coast.