like i said in the other how she wasnt running as good yesterday as the day before.. if u listen to it u can hear things.lmao. the pipe makes noises, well mine does, the back firing i guess.sounds like a dirtbike..lmao, yesterday it wouldnt do that..when u let off gas, it was quiet!!! going uphill it got "muffeled" wasnt that 2t sound and slower. i was 5-6mph SLOWER than THE DAY B4!!. now theres u a good one to answer.. temp, humidity, gas, oil?? idk, she is a bit dirty, maybe she was mad at that ....lmao