silencer of bike

Yes, it is an offence to make such alterations in the motor bike. It is for the vehicle owner to use his discretion.

The government makes technical specifications keeping public safety in mind and the manufacturers of those follow those specifications strictly as these are the conditions imposed while giving such licenses   Those online silencers may not be adhering to such specifications as no individual specifications are there for retail manufacturers.  Poison may be sold in the open market as it may be meant for some other purpose.  If someone intentionally purchases and commits suicide, one can not blame the manufacturer of that poison.  There are several online sites that sell contraband in different ways and as of now they are beyond ambit of Govt.controls and certainly within months Govt also brings such legislation to account them with such responsibilities and accountability for violations.