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I had an ESS tune in my M6GC, and i ended up getting a stage 2 tune and catless downpipes from Evolve - very happy with my decision. I had the option to go ESS but just couldn't find any decent information on power, or reviews by consumers. Evolve seemed to have a lot of information, and it seems as though it was a bit more aggressive which is what i was looking for, whilst having a good reputation for reliability.
Customer service from Evolve throughout the process was excellent too.
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