Here's some interesting figures all found on Parkers.co.uk. They won't resolve the 16/8v arguement but they are worth looking at.
                      Weight     BHP     0-60     Torque             top speed
mk3 gti 8v               1,035kg    115     9.8s      166nm/122lb/ft         123mph
mk3 gti 16v              1,090kg    150     8.0s      180nm/133lb/ft         134mph
Mk3 VR6                1,155kg    174     7.4s      235nm/173lb/ft         140mph
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Some comparisons
Current civic type R (+AC)    1,204kg    197     6.4s      196nm/145lb/ft         146mph
Focus st170              1,314kg    170     7.9s      196nm/145lb/ft         134mph
Focus 1.6 Zetec           1,171kg    98      10.6s     143nm/107lb/ft         115mph
Obviously this proves nothing except a VR6 is not as heavy as you think, in fact it's lighter than a 1.6 Focus!!!!! It also proves that i can't really be bothered to do much work this afternoon
