Hey guys, Im currently shopping for an exhaust for my 2010 FE570 and have pretty much decided on the FMF megabomb 4.1 system. My question is are the header pipes the same for all engine sizes or are they all slightly different in dimension? I have noticed that they seem to have different part numbers between engine sizes ( akro and fmf ) but am unsure if this is one of those marketing things to let us think they are different. Until now, I have been of the opinion that all was the same on these bikes except displacement, now Im unsure. Obviously Im only talking about the 70deg models, thanks.