Oil filter removal on two bros 4-2-1

[CH.CRAFT]

I changed the oil and filter today on my gen ii for the first time after installing the two bros 4-2-1 header system and the filter comes out without having to remove/loosen anything. I had a suzuki filter on it and changed to the k&n and synthetic oil now that its out of warranty. The k&n with the nut on the end has plenty of room from the header tube.

 

[Ezduzit]

 

[BA BUSA]

 

[GPW]

Do the use a stepped header our just straight tubing...

 

[macon454]

 

[CH.CRAFT]

do the use a stepped header our just straight tubing...

straight, slightly larger diameter than the stock primary tubes. The merge collectors look to be well designed from what i am used to seeing on race cars, i have a race car and into drag racing way more than motorcycles, but the principal should be the same on the exaust.