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GNP-Matthew -
In reference to the Hamann Sportkit HM 670. According to Hamann this mod requires Super Plus 98 ROZ fuel. Could you shed some light on this requirement? The NA Hamann rep I spoke with a couple weeks ago was trying to talk me out of this based on the fuel requirement but maybe he was misinformed. I can actually get 100+ octane fuel locally but not sure if this would suffice. Also, does Hamann warranty this mod? I assume it would void the factory drive train warranty. Any links to how this exhaust sounds? This is new territory for me. Thx.
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