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um, i think you folks fail to recall that the base 986 came without a centre rad and spec racers have no issues with brake cooling.
and that when the centre rad was introduced on the 's' model, no additional aero was added. so, from an aero perspective, the addition of the centre rad on the 's' model provided front end lift on a car that previously did not have it - you are taking air approaching the car at a high velocity and redirecting it downwards. this will lift the front. worse, you are introducing air under the car which will lift the entire car.
assuming the 986 spent lots of time in the wind tunnel and was the epitome of porsche aero engineering, the hack addition of the third rad was an aero compromise to address heat management of a large engine in a confined space.
regardless, what is the worst that could happen from redirecting the air upwards? more front traction. worst case - the rear will feel lighter as a result. it will not be lighter, but will feel so comparetively. what to do? change how you drive, get wider rear rubber, whatever. if you are on a quest for performance, it is foolish to compromise one aspect of your car to accomodate inadequacies of another.
otherwise, there will be less air under the car = less lift overall. not a bad thing.
to the op - i think you can use the gt2 duct but would have to trim your side rad ducts a bit. otherwise, you can keep the centre rad in it's oem orientation and just push forward and tilt using threaded rod and spacers. i would like to see the link you are referencing; the one i am aware of is on the 6 speed forum and includes the install of the gt2 front bumper cover which has the taller/narrower side rad openings. and it is hard to copy the gt3 rs install as they didn't use the gt2 duct iirc.
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