There is also a Naturally Aspirated performance kit that will get your performance up in the same range as the blown systems by using new internals. I cannot remember the company name, but somebody will throw it out there.
I'll let others speak to the filters, but I think you will see minimal returns if you are already running the 3xK&Ns.
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Changing to triple filters will make a good difference to the filter under the seat , wether K and N or not , did not notice a difference when I changed to the K and N under the seat at all , noticed a good difference when I went to the triple pods
Changing to triple filters will make a good difference to the filter under the seat , wether K and N or not , did not notice a difference when I changed to the K and N under the seat at all , noticed a good difference when I went to the triple pods