Thanks for that feedback Aaron, that makes sense and more food for thought. The SR-Y is a different pipe than Formula Y, with different characteristics. Based on looking at several photos and the description at this site http://www.out2win.com/catalog/2exhaust.html which includes the words ‘direct drive’ in for the Formula Y pipe – I believe “Formula Y” was just a new name RLV gave the same pipe they’ve been making for a while. Possibly because many people are actually using it with a clutch. So I’m guessing the Formula Y pipe gives a lot more low end power curve, and the SR-Y a top end curve.