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Talking of ram and pulse tuning, there was an interesting article published many years ago by Dave Vizard, all about ram pipes, their shape, and how it affected the power of the engine across the rev band.
There were some "strange" shapes tested, with some surprising results.
And picking up on chucky's comment, that's true, there's a lot of power to be gained in the ignition mapping. It's scary how much advance that some engines will take at certain points on their map. My 1600 Nova engine has points where it has over 60deg of advance, and that's on ordinary pump fuel. It certainly raised eyebrows when it was on the dyno! Consequently, that released bags of mid-range grunt that had previously been "hidden" by a p.poor ignition system.
Rob.
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