Is your bike ran with pure, m/ethanol or 'other' gas?
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Will this well dressed rider be Asbo'd for not wearing a seatbelt?
Your bike doesn't look a day over 20, a child! Not certain how/ if following applies to your area in UK, but could find out - in U.S. there are written guidelines for 'acceptable' exhaust and other sound levels (measured with a decibel meter within a certain sensitivity & calibration range, from a pre-determined position & distance from sound source, with certain dimensions of outer testing area met, etc.) - in 20/20 hindsite (but maybe for future) familiarize with what rules may apply in your area - pick up a decibel meter & tripod of acceptable standard to your local rules, and video record your sound reading effort as determined there - be certain to capture bike & exhaust in any vid made?
Maybe yule (it's Christmas) have an idea of if okay, so if there is an ASBO misunderstanding later - you could defend your preference in exhaust music.
As far as could be seen & heard, loud pipes don't necessarily save lives, but they do get people seen - which sure hurts less than the old "I didn't see him" excuse claimed after many collisions (with all due respect to those sensitive ears - seeking solitude near public roads made for m o t o r i n g - there's plenty of relative quiet with earplugs, and at home, the library or the graveyard if craving heavenly long-term rest)?!?!
Photo credit Las Vegas stunt chick.