I bought a 99 CBR F4 recently. Seller told me it had two brothers carbon full exhaust. I later looked into it and there is only a two bros slip on for my bike. Looked at the header on the bike and it is the stock header for sure. Im not worried about being ripped of for the exhaust I paid a great price for the bike. I just want to know what this extra header is from. Here is a pic of the header and a pic of the only markings on the header. Is it OEM Honda? Aftermarket? Is it even for my bike? Any insight would be great!

 

HM = Honda Motors?

 

according to this: http://snowboard.honda.de/nparcarticles/PC35.PDF
its a spare part

 

How did you find this? I had to find an online translator. Your right it does say spare part. Why would someone have this? Should I install it on my bike instead of the one thats on there now?

 

i just entered the phrase: "HM MBW E1"

 

JDM DC 4-2-1