anyone fitted or have good information on a full system?

i know theres been a lot of questions asked already but there seems to be no real 1st hand write ups i can find..i have just bought an 012 390 for racing and having always raced 450's i am wanting to fit a full system to give the bike more torque and hopefully a bit more on top where it seems to sign off early..before anyone asks why i didn't just buy another 450..its because i think with the type of events i do the berg will be the quickest way round the lap but i would like a little more which i expect a system will unlock..i know theres few about but for me it will be either fmf with megabomb, hgs with bomb header or the akro..can anyone tell me anything about any of the above on the 390? i have heard conflicting things about the akro header.. mostly about it doing very little though the silencer does let it rev on is this accurate? any help appreciated..

Re: anyone fitted or have good information on a full system

thanks, yes it does help some..did the mid pipe come with the fmf header or a seperate purchase?did the akro fit straight on to it? and just by adding the header and mid to your set up which i take it was already running the akro? you can feel an improvement throughout the range? a worthwhile one or just a little one? and thanks for the quick reply...
i know julian ran the hgs systems on his korr bikes last year so they must be ok as they did the season without issue as far as i'm aware..does anyone know anything at all about these systems?