Welcome to the forum , I notice in your signature line you have
" JMCA Race pipes "
The JMCA tag is a noise level stamp used in Japan - different colours are used for different years of bike and have slighty different db levels.
When the system was new it would be no more than 93db at 5,000 rpm
Can still be a race system but that's not the makers name.
Cheers,
MM!
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