yes sir its for a b4 specific. mainly from ebay. I will tell you guys what, the pipe on my gixxer 400 is a factory suzuki thin wall stainless race header verey rare to find , verey light . But here is the kicker a buddy on mine and a member of this board, is having reproductions of them made. they will fit your b4 but you would have to sorce a oil pan and a sump for either a gsxr 400 model gk73 or gk 76 and then you could run this pipe should be fairly cheap to get a oil pan and sump from the UK. Id say around $30.00 to post ! This to me would be your best bet for a great pipe! look for posts by stripes1976 or something like that!