So last week riding around at about 10.5-11k rpm the bike would lose power and i noticed a change in exhaust tone. The exhaust is kind poppy and gurgly, not exactly a backfire but not smooth. After searching around it seemed the fuel pump is common to go so I replaced that with a new oem one. Test drove it, initially seemed fixed but then once I had been riding for a bit it came back. Pretty stumped here, bike has 26k miles and is stock other than a slip on.