I had a ported banshee that started with t-5's thought it was good till the RDZ pipes made the same line all the way up the dyno with plus 5hp at the top and rev out another 1000rpms, my point is if you have a 63hp quad that could be a 68hp quad with better pipes why wouldn't you want this, your right the dyno #'s don't matter its in the seat of your pants when you hit the gas, but this post was about dyno #'s