also , modified air intake inbox is good but its not as good as orginal airbox on throttle.
30mm individual throttle bodies is best if yr have less space on side on engine.
modified version, upwards pointing itb is also a solution,, put filter socks after a wiremess grill on itb, and yr good to go high rpm
if you want air suction roar, then 70mm horns are way to go.