OK, Fair enough about Henry!
My CTR did not have a modified base map as you suggested, but was had a full day dyno tuning at CPL RACING in Sheerness by Guy Chamberlain, who owns Europe`s if not the worlds quickest turbo 650bhp CTR,a quarter mile time of 10.18 , probably, lower as its been a few years!
http://www.cplracing.co.uk/news.php
I take it your CTR was decatted to acheive that result?