Intake/Exhaust Upgrades for a 2003 3.2 S

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But does the 550 SE have a special tune to reflect the use of the 987 airbox & maf/holder? If so, can this tune be used with a five chain engine (ie my 2001s)?
It then uses the same throttle body diameter as any other S, with the same plenum & intake manifold as stock?
Am I correct in thinking there is not much benefit in reducing the restriction in one part of the intake, if it is left in place elsewhere? (Like the rate-limiting-step in chemistry). So if I am not on board with drilling new mounting points and installing the 996 intake manifold, with the attendant use of the 987 engine cover and loss of the rear shelf speaker bar, then this is pretty much a waste of time?
Or can I pick u a few horses just using the 987 airbox, modded to fit the stock MAF, plus a larger throttle body, without a retuning of the ECU?
Thanks everybody for sharing your knowledge with those of us lower on the ladder of flat six enlightenment.