Hi I decided to take my bike for new custom map so I was thinking to add stacks. I found a machine shop that can make them according to my needs for about 50 pounds I understand that the longer ones are for mid/low range and the short ones are for top end power. I have seen in this forum that many of you have combinations of lengths. So many questions arise What length or lengths? All short? All long? 2 shorts 1 long? 2 longs 1 short? If I chose different lengths, how should I place them? What could be the difference, if I place the shorter on the left instead of the right, for example? The bike is a 2009 used mostly on track days and occasionally on rides with other ss bikes. arrow full exhaust, KN filter, race ECU and loom, short gearing.