Correct re certification - $150 in Christchurch. The chap here said he gives you a sticker to put on the bike - under seat etc.
He takes photos etc as part of the certification and notes up a description of the muffler etc.
In the event a certified pipe that has not been modified after the cert he has a full record to dispute any ticket etc.
I have however heard a complaint or two regarding his db reading as he is down a back section surrounded by concrete walls that reverberate the sound off them!
I do have to say that in Christchurch I have noticed a reduction in the numbers of really cars since the laws introduction.
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