G&J Motorsport, Gobions farm collier row. 
Gary and John are based in Collier row near Romford. They use a 2wd dyno dynamics dynomometer. Before and after power runs are available on all 2wd cars. Also mapping on standalone Ecus is available. 

Kent based tuning network, we have over 130 installation centres nationwide. We offer some of the best tuning files on the market with unrivalled dealer support. We are suppliers for Dimsport Genius, and Dimsport Trasdata as well as other Dimsport accessories.