It's time to make that critical decision of which exhaust to put on this monster. If anyone has seen or heard the M4 GP Style Ceramic Slip On exhaust please reply. I love the look of these pipes. I have struggled with wether or not to do a full system or slip ons and I have finally made up my mind. I just don't care for the look of the 4-2-1 system on such a big bike. It just looks off balance. I am going with the slip ons to keep the dual look and performance.