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I had the Dinan Stage II installed at Nashville BMW. I drove home to Huntsville, AL and really didn't notice a big difference. Not sure i believe the stated 501 HP and 585 ftlb torque they say it makes with the Stage II. It was a bit pricey......total was $4100 after taxes and $299 labor for install. They had another X6 50i with the Stage IV which includes the exhaust upgrade and it sounded really nice. Not too loud but a much deeper tone.
Last edited by pufahl; 06-18-2013 at 09:06 PM..
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