ID this ATC90/110 exhaust

[mopar_man]

I got this off eBay and it showed up today. It's supposed to be an early Supertrapp design but has no stampings of a manufacturer at all. If anybody needs more pictures to identify, I can do that. These are just the ones I stole from the auction:
http://farm3.static.flickr.com/2588/3970083143_fbb23e101d_o.jpg

Also, does anybody have any tips on cleaning in the inside? The baffle is not removable and looks pretty well plugged up. Carb cleaner maybe?

[KASEY]

YEAH THATS a supertrapp,,ITS MISSING THE BOLT,, DISCS AND ENDCAP,,,,,,,,

[mopar_man]

That makes sense. I was wondering about the triangle-shaped piece welded inside. I imagine this thing is ridiculously loud as it is.

[shortline10]

here is a pic of the supertrapp . The baffle is removable just unclamp it and knock it out from the back side with a piece of rod or allthread . It should come out fairly easy . I see the ends for these all the time on fleabay . Nice score:beer