What fuel do you use?

Is it same regardless of how you apply throttle or if you steadily apply quarter?

When was it last properly serviced? Air filter and plugs? 

wagon v5 owner here ! 

 

no difference in power between saloon or wagon, they share the same everything about from the rear seats and boot etc

it has a slightly wider track and different rear shocks to accomodate the extra load it could carry over the saloon.

 

I would get a full service done. You should be hitting 0.9 bar which should be about 220-221bhp model. Also open up the passenger footwell, some 10mm bolts and check what ecu you have. There are 4 options available on these. The sticker in the middle E3 etc is a start then the reference code should start with a A... The ones with a 800-01 at the end have a more aggressive map on that the others. 

Power gains:

Ecu tek or Eculabs only options to keep the existing ecu - Eculabs is open source and better and has more toys, about 420-550 depending on what set up you have 

 

Also in terms of power,

 

Your standard td04 turbo is capable of about 280bhp.... i think this makes a very fast classic when boosting to about 1.2-1.4 bar 

Upgrades:

VF28 £200 very good turbo 

VF35  £300 even better 

VF34 £400 even better