Re: how exactly does rev range work?
For the most part, pipes will 'boost' the power band at the rev range they're designed for. Low end pipes boost low end, high end pipes boost high end; regardless of the cylinder porting. BUT, a low end pipe on a cylinder ported for high revs won't be as effective as a low end pipe on a cylinder ported for the same (low) rev range as the pipe; and vice versa.
Cylinder porting takes "precedence" over the pipe range. You'll be able to rev a low end pipe high on a cylinder with high port timings (ported for high revs), such as a Tecno/Proma circuit on a heavily ported DMP. The Dutchies are getting over 12k RPM out of the circuit pipes, which are "low end" pipes. Conversely, if you were to throw a Simonini (high end pipe) on to a stock cylinder (low end cylinder), you'd never get into the pipe range because the port timings on the cylinder won't let you rev high enough.
Maybe that helps?
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