[FatBoy]

I'd like to do some track sessions in my Kirkham, but we have a strictly imposed maximum noise limit on pretty much every race track in the UK of 105dBs.
Can anyone recommend a permanent solution for getting the standard steel Kirkham side pipes down to this level? I measure the noise on mine at 120dB. This was static at 4,000rpm.
If I was to cut the cans open, what type of baffler works best?

Thanks,
Paul