ok I have read that we run tuned pipes to exploit "exhaust pulse" among other things but the problem with this is that if the "back" of the tuned pipe is the wrong distance from the exhaust port the pulse "bounces back" to the exhaust port at the wrong time (when it is closed, perhaps) is there a way of telling if this distance is correct for a particular engine/pipe combination, or is this of little to no consequence -- please shed some light on this if you know the answers, as if my research is correct it can COST an engine 20% or more of power and 15% or more of max rpms -- these are substantial numbers, hence the reason for the question, not to mention the extra heat that it can generate.