I've heard so many times that the only way to improve the sound of a modern motorcycle is to remove the catalytic convertor and resonator box with a cat delete pipe or full headers.

I wanted to know how true this is. My personal, anecdotal experience does not sit well with that.

Loud bikes are slowly becoming public enemy #1, so more objective measurements will help us to make decisions going forward.

Here I used a dedicated sound meter microphone as well as a smartphone app.
I would have loved to get my hands on an audio spectrum analyzer to properly assess the different tone and frequencies produced by the different pipes.

I performed both of the ACU sound level control tests which are a static test at 500mm and a 2 Metre FIM Max throttle test.

Maybe you can think of a different kind of test?

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