i spoke to dastek in scotland today and they said gains of6-8bhp.they put me in contact with a dealer closer to me in norwich.....£450 plus VAT and gains of"10-15bhp"
i spoke to hillpower,nick reckoned 230 plus vat and an extra 160 if i wanted it mapping to my specific car....seen gains of approx 3bhp he reckons
chip wizard was 450 plus vat too.he said cant comment on gains,but u get 5hrs of dyno tuning and would be beneficial if the mods i had were decent...or should i say better than standard,just not being used to their full potential!