I reckon do the headers. Get it retuned and be happy with that.

You gotta remember that graph i posted up is a MSR graph. His dyno actually has a herd of small unicorns inside the rollers, just like rats in a rat wheel. So its no surprise if it always reads a little high.

I posted it up because it had a similar flat spot at 4k, not to compare peak power.

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Doing it for all the wagons out there