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i havent tried it, but from what i have read they are not worth the time or the money, too much cabin drone, pay a little more and get borlas, bullets, or corsas.
I've had both. Started off with the duel tip and recently switched over to the quad tips a few months ago because I like the look better. Both systems have some drone because of the low RPM range your constantly in with an A6, but I can say the 2 tip system had a little less for some reason.
I can't say it enough, do whatever you can the hear a vette with the system you think you want BEFORE you buy. There just isn't a right answer to this question.