Hi, mates I need an advice. I have 640adv 2007. And i have some problems with bst. So i was thinking, maybe i should switch to fcr by chance? I'm not sure if i want to change an exhaust, cause stock is pretty noisy, and i don't want a noisy exhaust. So, maybe there is no need to make sidecovers for airbox? But if i will not change exhaust and leave airbox as is, is there any benefits from fcr? Only thing i would like to improve is to make better response on throttle. Should i setup fcr or rebuild bst?