Just to recap (sorry),
I'd buy from Ebay:
- 74mm Throttle Body
- Larger intake piping
I'd buy from you:
- 74mm plenum
So the larger intake tube would fit on to the new throttle body, which would fit onto your new plenum. Anything else I'd need? 
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Porsche Boxster S Type 986
Bi-xenon Headlight Upgrade | 987 S 18" Anthracite Alloys | Android Head Unit | 5000k 55w HID's | 5000k Cree DRL's | 5000k Cree number plate lights | Cree LED Indicators | One-touch roof operation | Bypass exhaust pipes | Parking sensors | Ambient footwell lighting
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