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Guildford isn't too far from JKM's Dyno-Dynamics down the glorious A3 in Portsmouth. I'm planning another Dyno-Day at JKM in September/October so when are you planning yours?
JKM specialise in VAG and especially the 2.0T FSI platform. The Japanese tuning speciality puts me off due to a previous experience, also on a Dyno-Dynamics rollers.