Don't bother with just the throttle body- go the whole hog and get the inlet manifold too.
Back seats won't weigh that much... in my car (206) they were around 20kg-ish.
I'm actually having bespoke cams made for me, but if they work out well then there will be plenty available for the TU1 1.1 PSA engine (which is what you have). The cam basically helps out with top-end and mid-range power, which is crucial to the 8v TU engine as it runs out of puff quite easily.
Will keep you posted, just need a basic 1.1 cam to send away to the tuning company and I will get the reprofiled one in around a week or so.
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