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i've head a lot of that - you need to tune to get the most of all your mods. from what i understand, however, that doesn't make sense to me. the fact is, basically what the ecu does is measure air in and administer a set amount of fuel as a consequence. if you make changes to make more air flow more efficiently, the ecu will still measure the amount of air in and administer the appropriate amount of fuel. hell, raby was increasing 3.2 to 3.6 and using the stock tune. even at wot and running open loop with no o2 sensor to trim the fuel, you still have a maf measuring air.
now, if your maf went south and you were running in limp mode (throttle position) then you might be in trouble - getting more air than the computer thinks.
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