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Just got done the install. All I can say is Nick and the boys at ARH have one fine product! The quality and fit of the headers were great and the Instructions were right on. Only had one hang up with the 02 sensor extensions. Put them on before you put the headers in place for less aggravation. Other than that the install went smooth. This mod is truely bolt on.
Car pulls like there's no tomorrow but will get numbers at the track next month. I'll post the results. BTW car is 06 A6 with only VaraRam and 160 deg. stat. Ran a best of 12.37 @ 115mph before headers.