There's been threads on the plenum chamber previously.. the upgraded throttle body would probably give better bang for the buck. when considering the cost of say the IPD plenum and a used larger bore throttle body (i think from the 996 though nobody quote me on that)
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986 x2 6sp
2x Range Rover Vogue 4.6
2004 MX5 Sport 6speed Strato Blue (wifelet)
2x Range Rover Classic & CSK
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