Why not change back to the orginal exhuast?

Either that or get someone to start you bike after its warm and get them to rev it up a bit or hold a steady revs and you walk say a ring around it at 20m distance you will soon see at the front and bits to the side of the bike its not really that loud but its more of at the rear (ie the exit of the exhausts) is where you get the noise

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Plough on