Anyone fitted Two Brothers Header system (the one which takes std cans and slipons) Opinions wanted are they 2-1-2 or 2-2 single skin or double skin is the routing the same and would I need to modify Moriwaki belly pan as per Yoshimura system
Just joined list and noted your question.
I fitted two brothers headers and slip ons 5 years ago and have the following comments. They run very close to the side of the MORIWAKI bellypan and require trimming to prevent small smokescreen incidents.
The back curve of the pipe runs very close to the back of the sump and when you're fitting them, put a small spacer in between them and the sump (folded cardboard) to keep them away until everythings tightened up and then they'll clear it. Remember to remove it afterwards to avoid small smokescreen incidents. The pipes are extremely light, not sure on numbers of skins and sound delicious. I had mine dyno'd with just slip ons and full system and the latter allowed the engine to rev better at higher rpm's, with no loss of mid-range or low down oomph.