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Discussion Starter · #1 ·
2014 E63S came in and I'm Deciding on which tune to do...RENNtech, Velos, or AMS...appreciate any feedback. Thank you.
 

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RENNtech are badass for mbz so go for it.
 

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ECU TUNING GROUP based out of LA

Insane at tuning they do dealership tuning for rolls royce. bentleys etc
 
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