I'd be wary of that dyno figure, as UK dynos are notorious for over exaggerating the numbers.
What I recommend is getting some decent Italian Fratelli Bosio injector nozzles....you could see huge increases just with your VNT-15 turbo. You should only bother getting RACE 520 nozzles, and get one of the North American tuners to map it properly (e.g. Malone Tuning, Rocketchip, TDTuning, etc).
One of the best people to set these up correctly is "drivbiwire" from www.tdiclub.com - this is his website - drivbiwire.com/default.aspx
You could upgrade the turbo as well, giving even more power, but I'd say your 1st step is getting rid of those old-technology 0.216 T5 nozzles and getting the Bosio's with a much better spray pattern.
Then you'll see a real 167 BHP
or if you use the PD150 turbo as well around 180-185 BHP
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