Cabby gti

Ok my cabby gti has been serviced and checked over and so far everything is running ok.
Next i would like to get it running to its full potential, hopefully without spending a small fortune.
So if someone can point me in the right direction as to what to do next it would be much appreciated ie. tune up etc.

most areas you will find someone who will come to your home or work and tune your car on the spot setting all air flow timing etc generally costs bout 40 quid other than thn that get it rollin road tuned

Thanks