Ok so I basically got this header for free. the guy had no clue what motor it was on. just that it was on a. Built honda of those brothers. So I put it up to a d series head. didn't match. put it up to a b series head and it matched. I went to go put it onto my car and the bottom half is too wide to fit in between my training and my oil pan in the angle is off. So i believe its for a h series motor. My whole question is is there 2 different types of h series headers better completely different from each other as far as height and width? What's the difference between h2b header and h header? I just need to know the information so I can sell it to get my bistmoto header for my b series

 

Post up a picture and someone might be able to give you an answer of what header it is.

Should do a bit more research before you drop your money on a Bisi header...... There are cheaper and more reliable power choices available.