Look just fine to me,plenty large enough in diameter to not be an issue,remember there is a bar of pressure filling them up constantlyI doubt works well is those double bent intake tubes
If you look at current trends in ram air induction on higher end bikes the tubing is very small multi channel affairs. Also in the auto world with variable intake designs the channels are a lot smaller than the average person would think is needed. It is pretty ingenious the way some of the design accomplish an almost tripling of the tuned length with such a small volume of space required. jm2c