Hey there, don't know what kind it is, came w/the bike,
great little open exhaust though, but it finally started
to rust and get brown and ugly about a year ago (cheapy
chrome) caused mainly by "californian morning breeze",
west coasters know what im talking about, so i just sanded
it and gave it a few coats with black BBQ spray paint (then
waited a bit and ran the bike to cook the paint) and has held
well since; I spray it a bit now and then (touchup) since it always
seems to hit w/something or other and scratch the paint.
C'ya
Here you can see how it started turning brown
The answer is: Kenda Challengers