Get the PMB insert for fifty bucks, what do you have to lose. If it's not enough get a pipe. If the bike is jetted properly for your altitude and temps then it should have plenty of power and great throttle response. I was really surprised how much it woke my bike up and it's really quiet. Save the five hundred for other stuff. I can't believe how many people are riding around with things like titanium footpegs and yet have worn out tires.