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I have a 2015 gt. Its a A6 with 315 gear Mods are kooks 1 7/8 long tube. MagnaFlow competition 3 inch exhaust. C&L cold air intake. 47 lb injectors running E85 and tuned i know the air wasn't the best today but my best was a 12.1 thought it would have more then this. Mph was 114

Im getting my car tune and my data logs are showing a vacuum leak. I have a c & l cai ,kook headers. There is a hoes that gos to the cai that has a 2 piece clip im mossing the small side of the clip is this my vacuum leak. Could you make a vacuum leak doin the headers ? I.e.is the any vacuum...

2015 gt 6r80 when on my way to the track i can pull 1st to 7500rpm im s mode all day. When i get to the track and have the car in s mode it shifts a t 6700 rpm . car cools down 30 mims before trying again and samething .would like to know whats goin on ,think i would have better times if this...

2015 gt premium a6. just did the 1 7/8 long tubes kooks with cats and a 3 inch magnaflow competition cat back. They both went to 2 1/4 at the end so i went to a shop and had it cut and a 3 inch peace put in. So its 3 inch all the way back. Drove the car 30 miles Now i get check engine light...