It is a horn for the CRF300 model. It can be attached to the throttle. and the original air filter, no need to bend the other brushes By removing the original air filter pipe and installing the KSPP horn instead, it can clearly increase engine efficiency. Make CRF300 more powerful. A horn is a trumpet-shaped device or a horn of different lengths that fits into the air inlet in the intake system of a carburetor or throttle engine. It is designed for 1. Let the air flow into the inlet smoothly and evenly with a flow stream attached to the pipe wall called laminar flow. 2.It can adjust the dynamic range of the intake tract by acting as a resonant tube, which can adjust the frequency of pressure pulses along the length within the tract. (can increase torque, horsepower according to engine rpm same principle as exhaust pipe) ---------------------------------------------------- ------------------ #Advantages of the KSPP horn - The length of the intake pipe can be adjusted according to the needs of technicians. to suit your engine - Air flow rate can flow better. - Very light weight, ABS material. - The junction between the horn mouth and the accelerator tongue is completely sealed. - Resulting in better torque in the beginning, middle, and end cycles.