Been down both roads and have had work done in the past by most well known tuners/Cossie specialists. Definatly get greater satisfaction knowing that bar the mapping i have re-built my car at least once on my own and i feel i do a better job than most of the so called experts that i have visited! Would probably own a bimmer or something if i didn't enjoy modifying and improving the Cossie as for me that is more enjoyable than driving it 90% of the time!