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I have the US race spec on my E-90 and I'm very happy with it. I had the Gintani race on for a few days and it had a TON of drone at highway speeds. The Arqray has zero drone, but sounds great outside the car. It's loud outside, but it's engineered not to intrude the passenger cabin.
I am probably going to put a Sosi x-pipe on, or just remove 2ndaries and resonators to wake it up a bit. Again, I'm very happy with it.....I get tons of compliments from it.
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2011 M3 Sedan
2008 Audi RS4 (RIP 9-3-2010)
2010 Audi Q5 S-Line
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