100lbs is not anywhere near equal to 1 second in a quarter mile... I've seen people gut the holy hell out of these beasts, swap out as much as possible with carbon fiber and aluminum and still only end up with a 3200lb sloth (but hey, it used to be 3500)..... they still sucked in the quarter mile and was now louder and more uncomfortable to drive than the lack of gains made it worth. If you want better mileage... try to lighten it... if you want more speed get a bigger turbo and throw more power at it.
The stock seats are HEAVY.... either get aftermarkets or seats from another car and build your own brackets, track down a JDM Recaro set, or just swap out the electric LH seat with a LH seat from a JDM MKIII (so you'll have a matching non-power set).
A lighter one-piece drive shaft will help, but not just due to the lowered rotating mass but because of the reduced frictional loss in the center carrier bearing and U joint. Get steel if you go this route it handles the stresses much better than aluminum and won't grenade nearly as soon. Any one-piece drive shafts should be checked every few thousand miles for cracks or swelling near the center.
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