what would you expect to get from a 2002 998bp? had mine flatout and only got 145mph (on a private road ofcourse

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i got more out of my 748 so i'm begining to think all is not right with it! althought it feels ok just lack of topend. it's totally standard as far as i know! just thinking i haven't checked the gearing yet, what is standard gearing for it?
cheers,
joe