I remember many years ago in my former communist country bikes were a prized treasure, few and far between AND a car replacement. There was never any checkup for sound, we were al passing the MOT equivalent with all kinds of home made open pipes... Things have changed and now you might not pass with any aftermarket. Soon probably you WILL NOT pass with anything other than bone stock. Probably India is moving the same way. The longbottle might soon be a rebel's relic and an expensive proposition. Also, as a motorcyclist, I am pretty used to being harassed by police, is what they do. Pretty much like dogs chasing motorcycles, conditioned by some of our young fellow riders which go to 12000 rpm at midnight with baffles out.