The kart pipes with the perforated reverse cone are specifically designed not to generate peak power , but rev like hell , with a very flat torque curve - as you discovered.
Lengthening the header will lower the peak rpm , but then the pipe proportions will be wrong , and anyway it still wont make any better peak power.
The only reason to use this design would be if you had a 4 speed gearbox , or no gears at all , like the karts the pipe design came from.
Ive got a thing thats unique and new.To prove it I'll have the last laugh on you.Cause instead of one head I got two.And you know two heads are better than one.
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