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don't recommend a 987 plenum as there is a resonance flapper on it that your ecu doesn't have the logic to control (you could try slaving it to the flapper on your intake manifold, but from what I've read they open and close at different times). you could mebbe just remove the flapper and plug the holes? what folks are doing here is using a 996 or 997 plenum instead - the 987/996/997 throttle bodies are all the same. you will have to do some creative plumbing to get from the throttle body to your air box - some suggestions include a silicone reducing elbow off of the throttle body (3.25" to 3" if I recall correctly) and removing the tab on the engine bay that tends to interfere.
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