I just purchased a 2004 Yamaha Blaster I am not sure if the ‘power band’ has been radically modify to create a blast of power only at the top rpm range, or maybe this is normal. From what I see, the only change to the bike is the FMF Expansion Chamber. Maybe the exhaust pipe is the reason for the blast of power at the high end or maybe some cylinder porting been done too. Just like to get some feedback. I purchased this bike for my grandson, which is 15 years old. If I get some feedback is suggesting maybe the bike has been “ported” I may be looking to detune the bike with an OEM Cylinder until my grandson is ready for the blast of power.