Assuming a naturally-aspirated engine, and disregarding the model-specific 'induction kits' that you can pay obscene amounts of money for.
Specifically, I'm wondering what to fit to the twin 1.25" SU carbs on my Spitfire.
Is it:
1. Bare ram pipes?
2. Ram pipes with sock filters?
3. K&N/Pipercross etc. pancake filters?
4. Heat-shielded air boxes with cold air ducted from grille?
Opinions please...
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I think it depends what your priorities are.
Do you want to make sure that your engine doesn't wear out quickly?
Do you want to have a quiet induction system?
Do you want to have an induction system with low maintenance, that you simply change a replaceable filter element, or are you happy with messing about with oiling the filters?
Do you want to eke out every last bit of power at the expense of wear, noise, and practicability?
Under most engine operating conditions, the maximum restriction to airflow isn't either the filter, or the intake to the carbs.
number_cruncher
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