I would just go and buy a loud set on silencers.
That way, when you get bored of the noise (if you ever do) or you sell the bike, you can put the originals back on.
I have some loud ones on mine and I never tire of the melody they play - especially on the over-run - they pop and burble a little bit.
However, not sure what the neighbours think - not that anyone has complained.

The last time I was closely looked at by the 'Rozzers', they just smiled and laughed. They were obviously after a speeding/screaming 4 cylinder machines with dayglow riders.
I try my best, but I am obviously not dangerous enough these days!
Steve H