Can anybody identify these headers?

[kw86er]

picked these up on craigslist. They are not quite a match for my gs750 as they have a slightly different flange design. It will be easy enough to weld a new flange... I think they are for a Z900 maybe. They were sand blasted at one point and now they have a pretty rough finish. I was hoping they might be stainless but they have a bit of rust in spots. I will have to ask my welder/fab guys next store cause I don't know how to identify stainless. I know there is different grades and some do rust easier... If they turn out to be stainless I will try to polish them up but if not (likely) I guess it will be black paint and pipe wrap.

I have to figure out some more pipe to weld onto them and a muffler. The outlet is roughly 3 inches, not quite sure how to approach this yet. The header comes almost right up tpo my center stand (which will have to go) and is fairly centred under the bike. If anybody has any ideas on how to go from here out the side with a normal pipe size please share. I am thinking supertrapp maybe. What are people liking for a nice, tough but not too obnoxious tone?

[kw86er]

I guess if I pick up something like this I should have not troubles making something work.

http://www.ebay.com/itm/3-45-180-409-Stainless-Mandrel-Bend-Pipe-Tubing-/200909795624

[kw86er]

and this

http://www.ebay.com/itm/SuperTrapp-Muffler-S-C-Series-3-Inlet-5-Outlet-Stainless-Steel-Brushed-Each-/390692500871

[scrapper]

stainless is not magnetic, 304 and 316 are the grades with 316 being most expensive. If they are rusting may be stainless but are called magnetic stainless. If you have a pocket knife and it says stainless on the blade and a magnet sticks to it magnetic stainless. This is very low grade not much good because it will rust. Non-ferrous metals are not magnetic, brass, copper ect ect. Ferrous metals would be magnetic. All you need would be a magnet to tell. Hope that helps a little.