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all three rads in the front vent downwards and can lift the front. you can plug the bottom vents on the two side rads and have them vent into the wheel wells instead by modifying the fender liners. this is what Porsche did on the later cars (996.2/9x7 - if you've got the $$$ you can put in 996.2 gt2/3/turbo fender liners) and 996 cup cars (holesaws work - search the web for images).
for the centre rad you can block it too and get the air to route into the wheel wells as well (there is enough space) or try and get it to vent up and out a gt3 'smile' at the top of the bumper cover. don't use a 9x7 piece - they don't match the curve of the hood. instead, there are some aftermarket bumpers that have this vent (nice looking? dunno. cost effective? dunno) or you can just cut the vents yourself - check out a 996 gt3 rs for inspiration. the cars actually built to do this have special ducts behind the rad to direct the air up, which requires moving the rad forwards (and modified brackets and rad hose) which means moving the bumper forwards, which means a different duct between bumper cover and rad, etc. etc. etc. a big deal to do the full conversion.
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