hi, iv got a yamaha dtr 125 1998. its got a powervalve and im waitin for a full dep exhaust system to arrive
but i need more power and top speed as it only does 70 mph! gets there pretty quick tho lol. and also is fittin an air filter a good idea or not? iv heard that it is not. coz i dont want to ruin it. thanks for lookin , tony.