| Type in "dB Killers" on e-bay and you'll find loads.
I had some in my toolbox "just in case" but have never needed to use them.
At Brands last month a poor soul (who I hed never met) with an SP1 failed the 105dB test so I let him have mine - he passed as a result and was able to do the trackday.
I let him have them for 20quid as that's all they cost. He was made up.
The bike was effing loud before so I'm not surprised he failed.
I suggest you get some.
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