This looks to be the same exhaust I and a few others have: Ebay Link Not only is it a decent exhaust but you can also use the 300 series slip ons with that headpipe if it indeed the same one I have.

 

The advert says "Stock Exhaust System", but that header pipe does look a little bigger than stock?

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It may be just the slightest bit larger I never really paid attention but I do know the flange between the headpipe and muffler can is larger to the point of not being able to stretch the stock exhaust clamp over it and still use the same bolt. I ended up using a regular hose clamp as its so much a pressure seal as it is a joint.