Dinan would be my last choice. There are a bunch of choices. Some tuners provide handheld flash devices or cables for your laptop so you can flash back or do an update. Evolve, ESS, VFE, and a couple of individuals like Mike Benvo and Bren all do tuning. Bren is local and that makes things easier. I have never seen a tune shootout, but all claim gains based on before and after dynos.
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