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I think there are three tiers of tuners...
1. In-house tuners. This includes AMG, The M Division, SVT, ect.
2. "High-End" Tuners. NISMO, McLaren (although they're starting up they're own thing), Hennessey, Callaway, Brabus, Geiger, ect.
3. The bulk of them, just tuners. Zele, Mines, Hammann, Novitec, TechArt, ect.
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