Same item as seen at the following link with the "sound arrestor" (baffle insert) option. With that option, this item when new was $800 plus shipping. See it at:
This item was designed for the air-cooled flat six on the Porsche 911 and was used on a 3.2 Carrera. However, it is very compact and can potentially be used on any engine with a single exhaust outlet and three-hole flange, and space to mount it. It could work well with any inline or flat engine with room on the exhaust side, or whatever else you are creative enough to make it work on. Makes with potential models I can see it working on include:
Alfa Romeo
BMW
Triumph
Ford
Mercury
MG
TVR
Stainless steel and in good usable condition with various scuffs, marks from thermo-wrap, etc. - see pics.
Located in Lakeport area of Longview. Cash or will consider shipping if paid by Zelle.