Put this on my 23 Outlander XTP 1k with tune. For me there were two selling points on this muffler. One was, no packing to mess around with. The second was that it is not overly loud. The tone is much deeper and with the quiet core installed it is only 4 decibels louder than stock at idle (from my decibel meter measurements) by my ear, it was only slightly louder than stock while riding, even with engine breaking on Max. Without the quiet core in, it was only slightly louder at idle ...