Thanks a lot anyway Bill and all the other guys! I am now thinking, maybe I am just looking a gift horse in the mouth. This Zard that came with the bike worth around EUR 2.200 new, while I paid the whole bike EUR 6.500. So maybe I could just try to remove the CAT out of it (it has a honeycomb-type CAT directy pressed in the silencer entrance) and be happy with what I have, rather than to push luck with improvizing with 3 pipes