They are tried and tested on the bikes listed.
Stomp 110cc 125cc 140cc
Demon 110cc 140cc
Stomp 125k
I note the reviewer's exhaust is not listed, but it did fit.
They do knock off a considerable amount of decibels as we have tested them with a noise meter.
And its the thumping sound that causes the noise trouble.
They are £2.99 inc P&P delivered, and yes the printer was running out of ink
They have been used on tracks that specify a maximum exhaust exit bore for environmetal regulations, this being the regulation for riding, when exit bore on some exhausts is just way too big to qualify.
They do not make them road legal quiet, as that requires internal baffling.
They are simple easy to fit adaptors to get past some track regulations and are easy to remove as and when required.
To be honest its not worth selling these at a price below £2.99 delivered.
If you want to spend time and money going out to search for a similar sized set of washers to do the job then thats ok.
We are working on an internal baffle noise reduce system but that will be considerably more expensive.