Silencer, cartridge MVT ENGINE absoption of competition for scooter

Here is the engine MVT quiet, reserved for MVT 50cc scooter exhausts but may well be mounted on the other 50cc 2 wheels. His fixation is done by 3 screws between axis 35mm diameter 6mm standard. Being a competition model, this cartridge has no flange, it comes packed with high-quality ceramic wool. Length of 25cm silent without the nipple.