A lot of people ask about slip-on exhaust vs full exhaust, and whether or not you need a fuel controller (power commander, bazzaz, ECU flash) when you install a slipon or full system exhaust. So let’s cover that with some real data. Different bikes vary a bit because of where the stock restriction, muffler, and

***This is important, please don’t skip over this: Before I just post a bunch of graphs of dyno runs, I want to explain a few things.  Dyno charts can be very misleading without some back story and more complete information.  First of all, dyno charts are generally only printed for the results at 100% throttle.