Crossover type exh HP vs non-crossover

acotrel said:

If you fit a race cam with a very restrictive muffler, the cam spot may be suppressed, however there usually at least a minor increase in power across most of the rev range. I would expect a better result with the crossover, however I doubt the resonance effects would be anywhere as good as with an open pipe without baffles.

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I have never installed a "race" cam in a Norton and experienced an increase throughout the rev range. Only an increase in it's ability to rev.
Only an increase in compression ratio ever brought the midrange back close to what is was before.

Of course the seat of the pants feeling and the dyno didn't always agree but a spirited run up a mountain pass will agree with the dyno.
Jim