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I have been researching this for the last 3 months - and talking to owners of most engine tuning vendors. I made the decision to go with the JB2 - which appears to be the best bang for the buck as well as safest tune for Denver's high altitude. Even the Dinan tune worries me at 13psi for up here.
When I had my Audi S4 - I had the option to go with a very high strung GIAC X chip - or an MTM chip tuned for this altitude. I'm glad I went with the MTM - my car put 40k miles on the tune with no problems - where others were blowing their K03 turbos.
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